Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ffb924eb5925c08…

MALICIOUS

PDF

87.7 KB Created: 2021-07-01 12:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 03360e376f30d617ea5bb3c53fe019d0 SHA-1: 95e4c3afc762c10f0d1b85e958339136152f88da SHA-256: 5ffb924eb5925c089bdd6b0d542546674b30f6764338e59c426c6c44a77e46a2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed for SEO poisoning or phishing. The presence of these links and the overall structure indicate an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://wastran.ru/uplcv?utm_term=do+you+get+paid+time+and+a+half+for+christmas+eve PDF link annotation
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1999222ba3---55765039321.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cac13270127---4614693521.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e44930c5---nezusisugebadutet.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/venido.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a8a6b2551fd88340f03dd71437c3c237/xarugon.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/2f29d2ec70a4158a8d524b446bfd995c/50372295878.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/815e70b4955e410ff7e11aa4d74795d9/38349008348.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc67ef1d9b0---49583890140.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/bafasejivavuxijuk.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/70a8c14ad75c6f2d1efa118968bf7e59/54129722880.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021521212175213.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/68404457547.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23f91e0d4f---wixirelapojavulotikagegir.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/xupumuroxok.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/56270276169.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/8374b3d7ccdff310b862010b326c93af/66605016660.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/85351a78ee3b476322457b72f0df5b6d/82706058116.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8b62eddcf---25904509072.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccac7b2971a---dabozoxonodibetipakovez.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac05197b20e---82116259913.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/60dd6dc9e52e3e651f2787a5b5c839f6/50384524012.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/24b405bb0fefae6ead1dcd2bc23d08d7/zubigiredegatojoxo.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/qhp8pdvjq2e9n5fera7jtkqhtd/megev.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e41e9e7e75fc48de7d61a98250c55111/sezirixazanafajeduridege.pdfIn PDF document text
    • http://flexicourse.cz/res/file/69673790210.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210623054140.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_off0000ef77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF77 11348 bytes
SHA-256: a38fe92aa9487bf0db926c8a552ca8df36c08aae76437ee93de1b249d5100058
font_01_sfnt_off000109d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E4 17448 bytes
SHA-256: 392f5d0fe8bc31afad6c75f53739d00a15dbc6b819d4ee9d66ef2c7e59a73563