Malicious PDF — malware analysis report

Static analysis result for SHA-256 903ebd348564c869…

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 21:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 730915bd52d4889e3fd0484daf4315b2 SHA-1: fd6b58899514bf712e496f5fc4e1f534927aef66 SHA-256: 903ebd348564c86950d22fdd44f71180d79e6c2be1aaa7ed1c9f7217ac94ca58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing the formcraft plugin for file uploads. This behavior is indicative of a link farm designed to host malicious content or redirect users to phishing pages. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3d788e61f---63453945448.pdf In PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ee8589032---sikalajuzobedijuzod.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/dbkqakoull5nleh6u0qp1ebvgt/52544309752.pdfIn PDF document text
    • http://htwy.com/upload/file/59207248421.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/65308932236.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607495bd2deeb---rugibikakobogobawutopes.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/87479227309.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/90441105790.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e984e6edec3---nuvopar.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/92844641289.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/46404525456.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7a814129---povusurawom.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/46460117074.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/93938760638.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/eae53f75a43bc5dec502c254ddd60694/27866880353.pdfIn PDF document text
    • http://446888.top/userfiles/file/sinekalonusekobuzed.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85cacda86c---ramanokejasadamoneb.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/jenusikimapodigopuwuw.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b91517096---2709643034.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/51793725355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=harry+potter+7+part+1+full+movie+freePDF 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_off0000cfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B3 17080 bytes
SHA-256: d67ef4cb7ea40a0c9eaee9a4c5d65db839124083c21a1a58d9ad0d414cae4b66
font_02_sfnt_off000113b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B6 10620 bytes
SHA-256: aa0f760b24f8d0a9719d75a67511589f6d87fefa81005529e9ba811aa9736f4d

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