Malicious PDF — malware analysis report

Static analysis result for SHA-256 605f12e70f3ca96e…

MALICIOUS

PDF

96.9 KB Created: 2021-05-02 01:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60362de37340e537ac61543431ec7a0a SHA-1: ad43d20e61b4a6fc60423bb1ee6489570b5e3ce7 SHA-256: 605f12e70f3ca96e8a28853281bcf04a636e031330cd36b8b4591b9abc4d7c4c
176 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it's a "failstack sheet" which is used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd12dc4083---bukefuwudowexikorifefijet.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/6slfa2kqol43j1cc6f1s0e3h43/zoxaxogewobokuviw.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c90f0b5c5e---77404578348.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d346785e13---zegivolawewebapirogikim.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/d534755592639d7cfda58c41e322aa44/61110125350.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/5816c3c5055fd9b8f15f6823fd57e06b/vadutoloxuferikowedatadof.pdf
    • http://alhouti.com/userfiles/file/65577182842.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb1d3337c5---51950561794.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/1or7s5k6kp55lkls1rtmonslod/xoxofekipatal.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607871d3394f5---zimawewidamati.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ikuln4assgdl8nb5699ee2suoq/wilaximujesaxabokovuviki.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607925419481d---nebomarafoxapuverekade.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085be01a5b79---bubozonexil.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef81a6d88b---sowogomut.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759ab0853b8---gegatibolufizil.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/252a77000d7b9f718b28b0dcdcd0e2a6/julilajub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=bdo+failstack+sheet+2018
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011768.bin
498ff7b046f12147929b7cf8208809abaff5cc0625a80b573bc30f21d7c15926		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11768 5328 bytes
font_01_sfnt_off00012991.bin
c397c7ae3951bc66755d53a90239a11f9cdb29f8af8306512c9c5065c626b907		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12991 13256 bytes
font_02_sfnt_off00015567.bin
58b04abd4a2cde557a820e918121ec9738f9de37d4949e7b8c9e4ecf18f5695c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15567 16164 bytes
font_03_sfnt_off00016a81.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A81 4324 bytes

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