Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f328f8c1cff05b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 22:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5cf9c30eb7daf9ba0150415d6b761ffc SHA-1: ff57330c56725d28bb479c0314006bf5a7692f34 SHA-256: a1f328f8c1cff05bd0a7bb043ab89096517be11e08f3b9405519219cafb67ce5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. The heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites, likely to host malicious content or phishing pages. The 'SE_CALLBACK_LURE' heuristic suggests the document's content is designed to prompt the user to make a phone call, a common tactic in tech-support scams or callback phishing schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://laborke.ru/uplcv?utm_term=respira%C3%A7%C3%A3o+aer%C3%B3bica+e+anaer%C3%B3bica+pdf PDF link annotation
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd96f06054---73808312886.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/91247667463.pdfIn PDF document text
    • http://innotack.com/userfiles/file/siluzexejegivoterewodesi.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/59636663208.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c303bf588---19241229617.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609053ec5bf81---21592025295.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/28140468884.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/bumojamozexujamixakaduku.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/86028737115.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/9037ea7e264ec6807d4c1855b65951b4/dojonusakemusebij.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/petebazapanulonon.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/tilelojobej.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/774185731.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607af64a85b51---81289893290.pdfIn PDF document text
    • http://belst.by/upload/file/vajawasenufutoga.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a1e423684---letupovisubupejazareluw.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/51930996863.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/63832920783.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/79196126561.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/kixolanulesuwepeje.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/rk8iu90qkaqmvahn1gheqdm8ul/74463971461.pdfIn PDF document text
    • https://subarini.ro/mm/file/99320243496.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/dogifi.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/34276247746.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609883877421f---22274304837.pdfIn PDF document text
    • 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_off0000d6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E1 11256 bytes
SHA-256: df91cc514973b85703c55ff1b7ca3868bde194a6c7a410ff0d14fe4f08e7778c
font_01_sfnt_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10846 19900 bytes
SHA-256: 3fee4d007495d0436bd1addc9e5022000314ca5b07b83525d6e234d210b5572c

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