Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bfa5f8c60f6631…

MALICIOUS

PDF

89.7 KB Created: 2021-06-27 01:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2a4350df0ea1859cca63c0f417de595b SHA-1: 9bd9313ef56a8ea8b26fac34c2cc0ea669ddf417 SHA-256: c5bfa5f8c60f66312ae0bfee6b0e1b90f7b026de0a22e1789669739dfab78943
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The document functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to deceive users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5f164619---12214865053.pdf In PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/28144568620.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160810025ea978---39410636413.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/1ab47ba4cfa13e3d029e0b5ce68bf1e5/77633493586.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/vetaxijimipumim.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00d3a170e9---gufenowafa.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/h5u8p6pp34rp99iuj47q8tt9oc/18001723185.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b17c86c3a36---93823116331.pdfIn PDF document text
    • http://ymmicro.com/files/files/82135810041.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b48ca0482d1844ae3496f18ff63c486c/sedefusedoxewizikidan.pdfIn PDF document text
    • http://sam-global.info/files/file/81221468627.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/i639am87m8a2i2ug5331b3ig4g/81419865078.pdfIn PDF document text
    • https://ms02bet.com/contents//files/56803355274.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/40665850819.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/af02ea10b5b88a5ca49dc770b945b8a4/vamunedokexaketu.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/fixewex.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b52272e7e2b---sizukuwego.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/badigogeruvusaloteg.pdfIn PDF document text
    • http://strandedtattoo.net/file/lafevukugivirupoxod.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/6936aabdfe49d36665d3c64021fba988/tewemakinonalurifala.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/jinifaditade.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/bkd60m2tdjvsdiejo2ehvgg58s/38620604826.pdfIn PDF document text
    • http://avenue102.com/uploads/file/18540564488.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f62a9c926bd5c015329a1ac0f5d2ac46/12728600574.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d724e2aea6---63618193819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mdtp+calculus+readiness+test+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_off0000f820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF820 10568 bytes
SHA-256: 32b9847703c886af635e27978905f0500352e99aca73004bd9690dbd42b43870
font_01_sfnt_off00011063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11063 17932 bytes
SHA-256: dc4bb1f9ad83b5950714b4e0e448a5dee0abab0e38523118030a3e333225819e
font_02_sfnt_off00013fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1