Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf19a8533f117bc9…

MALICIOUS

PDF

97.5 KB Created: 2021-08-18 00:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f3840e69aecaad4cf5e384976ba2c75d SHA-1: 0036cb9edb5e7469acd662f5e3b2748c0891c0e3 SHA-256: bf19a8533f117bc9baaa1a8ea25e5f910427fb551a5772f0d32a766e38f1c6cc
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to execute code or redirect the user to malicious sites. The presence of a link farm and the use of compromised CMS upload storage further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=how+to+turn+on+metrix+vape+pen PDF link annotation
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/zegurewapikuk.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/vunolazaxikujasenipigo.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b5ab44790---votoxasaxumadikovazezup.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8bfa16204---92406215986.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085c46cecfca---24194896290.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/paroxewol.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d56b7260ba---dofarimow.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/lujidoja.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f1dd0da54e56e910b2a9b9c62551e7b1/setitum.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/tadonutalapiruvu.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/61671271206.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/kdlc3dg0ol1nf443dsubomeefo/72407469167.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/56455393264.pdfIn macro / runtime command snippet
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/daefd6a420c79ddbce1a4159fc7d0ba0/7089958070.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/3bccd1d8f0ae59fb1c948c3378288cb8/70285039014.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/lodenaxi.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202108171418296750.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112fc5168388---37353167369.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/jepawunilegejusoxesat.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/3obq6avmn723p3ehjitq4ljpvv/ginijebeminawemonifafem.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/domewasaforumoroxuzusazuk.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b11a691302---bakime.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/71468919142.pdfIn PDF document text
    • https://abril.pe/wp-conIn macro / runtime command snippet
    • 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_off00011991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11991 17772 bytes
SHA-256: b0046e1603140fbbdb99f834cd977c11876a99b96ea1698e105897be7fffd8fa
font_01_sfnt_off000147eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16002 10544 bytes
SHA-256: f88a31799aca0f0e754ca876e6ab82e679c511311213e67e83f7b9435f50b75c

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