Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a1cce56e67ea3f…

MALICIOUS

PDF

91.6 KB Created: 2021-09-06 02:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 16274db4c6837838f35b26290a490721 SHA-1: 827c98299965aec2d597f92f499f8baf97939a88 SHA-256: f9a1cce56e67ea3f871e8c5d0b9340307fe2e04b7c1bb4ccd200a697ad576456
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://plafondchauffant.fr//img/user/file/tapeb.pdf In PDF document text
    • https://inncredel.com/uploads/nipuzobabogelakubolemevom.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd78f8b8ef---fupapojafoj.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/8758559487.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/neduwigonibabajiv.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/geloguzesixepolimugij.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/51317956699.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/770045179.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/72975349373.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/40028252259.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/9f3b8c33934b0bbb61d05f856c9da63e/guxegagunegeresuk.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/5638996600.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/podiropopiwat.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/03846f39619ac65304114572c91f5eff/sovetapuxusexuridunalaxuv.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/zidewagasonubaruridudotuz.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c31f8413dc---wamolisoxogutotijiviv.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/fogasijawese.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/30279031831.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/82346654020.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/afvr39g766dfaqa0jafbk9b6g6/sakojegojagomexibeboj.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8545764e46---mezigufufokeze.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/93424527683.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/3732592564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=chapter+6+section+2+changes+in+market+equilibrium+worksheet+answersPDF 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_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 11704 bytes
SHA-256: c3ec2c1cc58d9a50617aa4748a4de83f5f37992c487f3e8b4f4e6d1cb366c6aa
font_01_sfnt_off00011945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11945 18032 bytes
SHA-256: 9b7a82bc2b89ef46b9194d5d478b8fef349337413831a4cb31bda1ac80013291
font_02_sfnt_off0001480d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1480D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1