Malicious PDF — malware analysis report

Static analysis result for SHA-256 4756fae091a510e4…

MALICIOUS

PDF

73.3 KB Created: 2021-09-06 02:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 61ca7d712dd8d27062d7624a77d0e466 SHA-1: 5d82834c9180bd52a8636f278cd594028f9f9f31 SHA-256: 4756fae091a510e4066aaa94a37215030497f1f46b35fe2314aa7f2bb1a8959c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, suggesting it's part of a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://vina2002.com/uploads/files/rikaketus.pdf In PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed357337bd---dazopivejade.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eef88675c0---65820958792.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/90920562163.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/posevapozumakepa.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/03a97ceb21e530dbcc68759d5b39fc4a/30496941776.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/3962424579afb5e55b0e1ec4714afd7b/75778964518.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210621220455.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/kavadazezuvejaf.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/surewewanusilezop.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ee10c9fb5---modalomivisanoworadafit.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b365605ee6a---xazumoripifil.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/a407e068137d33ec744452f4ea624df4/62356544577.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f6b0b67f10dd81cbe13ffb59810da46b/vuxinoloditido.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/78461198510.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/cbe0ae998481d72a5a67608d5300e941/xitenixatudevakavitaputu.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/9551fc71ec625e6cf5d42a8c5100bf74/28946688975.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/39275759168.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/f059471cee9e44c96099c47c62717baa/mosebotuwusedoza.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/04cd4fda185b6d07c4a4a857f4eb1b48/zipilodo.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/bagerar.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/69204511443.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/mubuduwalolumele.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/58949461940.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d2930c5fb---61246829947.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/gozomewuvumuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=resultant+forces+2+worksheet+answersPDF 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_off0000bd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD27 10784 bytes
SHA-256: bcb4db603b61be8ec7ec5cf1866a4563f40045d1976e5d1ef3f4367f2d21cec3
font_01_sfnt_off0000d628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD628 16252 bytes
SHA-256: 4af08f094f3e7f02b1c7b35a712b2834f9de5f2d0a9b7dc1859d49a440de5583
font_02_sfnt_off0000ff7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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