Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0cd1e542871e28…

MALICIOUS

PDF

91.1 KB Created: 2021-07-19 19:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 61479aba0f8743dbd84a3b470ed24284 SHA-1: 67837b8cd625adacbe24b6b77dce2be4904e4b43 SHA-256: 1c0cd1e542871e28c828562b0720a9d68eb7ca4798e3da5e15d9c648a9d23dd2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is part of a link farm designed to host malicious content, with specific rules flagging it as a compromised CMS upload and a callback phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c31813043---5902200267.pdf In PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/30154402027.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/594fe8edef88efb6973b9c91f15c4b5a/zixubosixewimogigog.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/89258005934.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/88330407558.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/vebebajiwaxixawiririzola.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/vuloguf.pdfIn PDF document text
    • http://4bx.pl/public/file/gafewelulanasawobiro.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160745db324d87---lalapejepado.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806bfbc96b4---nerepuvipode.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/74375154752.pdfIn PDF document text
    • https://noddy.nu/images/file/lifebebupisowewiwi.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ad5c79ol0hssag846508um6c57/motufuzimon.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/51348624884.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216664596151.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/caq6tuf1vm801hlr7it46jjgfe/liwekerexapogomizizu.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/bujvm7n1snpf2kktl8ejcqbhe4/21267514993.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/c5df4f9890f8dc46e68e3fd2ce11ae56/16824793721.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607687d995847---dimomujozodubu.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/19414481362.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/nekodutusetatofivatu.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/c506369ba705dc336df8bad2e2cce123/xixasasorinuwagugidezewaj.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/44baa06e24633aea29982f51e6a66252/rabemos.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/81f6b309a0088777dbed7517ce89fc38/9155169818.pdfIn PDF document text
    • http://jarosi.hu/files/file/42837044135.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/32c8401ea6a965470fd92a38b03a82de/zixefi.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/567af92632bfa533da7aee775b8d550b/wixafak.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/77970134889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=placer+county+inmate+search+onlinePDF 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_off00010192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10192 10708 bytes
SHA-256: a4a532999a50d7643fda2e2bc5cfbaffb5deb2f9f669a30c505ff243c4b40b63
font_01_sfnt_off00011a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A03 17092 bytes
SHA-256: bb371574a366ba5df3b4b539f6a1fcd836b58c0e0e930387eaf851299c73df7e
font_02_sfnt_off000146c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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