Malicious PDF — malware analysis report

Static analysis result for SHA-256 abca2bd341b60029…

MALICIOUS

PDF

90.7 KB Created: 2021-07-03 15:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1701467e97da8bcb331949d6ddc051db SHA-1: 5bd96562c5f37755745981a88fdd0800147dfbd3 SHA-256: abca2bd341b60029b0e79e0e343cfc0e9da14e80d7bd83143328dd34b81d8e4c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these external links. The document body is unreadable, but the heuristic firings clearly describe the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6a3def8de---xorarazagobeligadowidesi.pdf In PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160867601b793a---pekime.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9158ba756---76470992323.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/31732941280.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/65165089874.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d67f14a337---vuner.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b77dac032f2---rekuwixopotugisu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160d07110f1e1a---digaputoseko.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/a067947bed42d06db637c4694283d844/97231240512.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ab54ea5ff84---95286546457.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27e9175ac8---9347759318.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/7307201ca175f0592fff4ddefada809b/lovabodidovawogokegi.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160737e59d61c3---manavitixelufazedefune.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/10522511160.pdfIn PDF document text
    • https://hgb.se/filer/file/67900245112.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0441cbcae---65943677741.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c2a13436a---wimowanojelevevu.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/84724348519.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/89689236364.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/17129134123.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/49411571989.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/26068765981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=things+to+do+in+russiaPDF 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_off00010152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11964 17204 bytes
SHA-256: a1e834feb7d3f4f1eb66ea4be045b9c7894bc5ff7a946e0f9fd8ba3b15e3914f
font_02_sfnt_off0001453e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1453E 10412 bytes
SHA-256: cf82fd03aab0142a2dcf47867da8d898662131fca2e47d9cc65973f85e54d7da

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