Malicious PDF — malware analysis report

Static analysis result for SHA-256 316ff8ffe7c95f09…

MALICIOUS

PDF

90.8 KB Created: 2021-07-03 09:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0c08325b5a13adf676776088df13b80e SHA-1: 9443866a87f9b8ecc80774d5fe78ad70ad7ea741 SHA-256: 316ff8ffe7c95f09b3630707d0efcc6a69772202c75c27811ff0a0b101ab1de5
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The 'SE_CALLBACK_LURE' heuristic indicates a potential phishing or tech-support scam pretext, aiming to trick users into interacting with the provided links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of vulnerabilities or the delivery of further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/9835356d3bda11a0a9dbdfcf860b61d4/zawujekedeporefu.pdf In PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/13976603238.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/hdlq44qohoc342ch6u3ocmd6f4/98066872997.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/66694706901.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/18963505919.pdfIn macro / runtime command snippet
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/655d30f5e3b83702413aea30746277a1/64756589277.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceaf3534bb---zagatugobefego.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/wafubefomoza.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/20ec65b236cc86fbe8f33ee23f9d7471/litoriginagorikevazokuno.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608d24c2712bb---fivudotabodur.pdfIn PDF document text
    • http://m2m2design.com/userfiles/vamuxuwovonizixatoragox.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/lewolegikazobuzulagab.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/luvovoradafimeman.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/pokipajumuwuxesenef.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/zuwexekaxawiwogotuledukep.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/96551342017.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079461733693---69958432252.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160930576383b8---45766302218.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c2e9b30d7---pifaxufudulivopevat.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989d7001a33---polunaxamufexe.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729b7820055---82041697282.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609322608961d---zagexidetexulob.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/15658704700.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/52262645784.pdfIn PDF document text
    • http://gibeaufamily.com/clients/870383/File/74365284866.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608585b668ac3---rafur.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/fiIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=best+classic+meatloafPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000febb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBB 10344 bytes
SHA-256: f53e58d5d8667c999a84f6101890ccb136ff173907c36b200075e9971e79e248
font_01_sfnt_off00011625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E37 17772 bytes
SHA-256: 4eb673a235a27d7192f5da49b44fd277acc488e65ea1a8ab3b975611d73879f6

Open this report in the interactive analyzer, or submit your own file for analysis.