Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3e8a5addfb1670…

MALICIOUS

PDF

105.4 KB Created: 2021-07-09 14:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 83dc136b65bb5327c3030ae7c3d51858 SHA-1: b21cb921d0c5e225afa36b5602504404a6388b13 SHA-256: 3f3e8a5addfb1670d6ef35e2c7676d767bbd720e39d65c3181ce76f024df5d98
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs pointing to various websites, many of which appear to be hosted on compromised CMS platforms. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and does not provide direct user-facing content, reinforcing the interpretation of it being a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6199

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://indianaquesters.org/clients/9/95/9573c8d6e108c9729a37356986dd5b5e/File/waruditofotuji.pdf In PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc3ba980e8---61310076692.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/uvoo6h6k6l29ud8qddbvsl6cl3/10004412313.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210604160031025.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/58de0804801dd07dcb0ca5c623566330/gogazetetutegusovuwid.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2ca809207---buwebapokibadalofole.pdfIn PDF document text
    • https://seikico.net/img-tym/files/70328149090.pdfIn PDF document text
    • http://zuche0551.com/upload/file/57987872683.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ee0150b33---vitaxuw.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/46d8d233b5d07922911874ea98432020/gatuvovutavufoxajam.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/gezoriv.pdfIn PDF document text
    • https://migger.dk/userimages/file/79026399044.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/pibaxumunono.pdfIn PDF document text
    • http://synergyproperty.com/images/files/pamigej.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e3edb7692796be12c51a784e222400ed/78323968005.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/fe960be7803c74c450ba93c390c9a116/35068238749.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/soxeferepoleti.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e950d1b1c---kusulukowinakikok.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/bemap9ano3rdm874fg65jqett3/xoranufi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5lirm7qgnop496fl0m3rg376i0/panoxobapasotevewema.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/e7e7860fe434dec4fc58ea7d0f26bf4e/32609900562.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1625696028.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df5a884680a---555076259.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/0on8qnjihs16erfvtfrj0l7413/luzuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=northern+rescue+cancelledPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1