Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77684c70f635d5f…

MALICIOUS

PDF

105.5 KB Created: 2021-07-02 20:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2e1bbbb96d12b0366f472898382ab37d SHA-1: aff1caf6dc9f5a38eaa0465837c3053c82a2df34 SHA-256: c77684c70f635d5fb1c6c9761badca11d62c0d3204394fdc64e71b342c1d93de
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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) 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://krisoc.ru/uplcv?utm_term=economic+geography+grade+12+questions+and+answers+pdf PDF link annotation
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/gjl0e4u31jj1ae6rk02bovu8g3/nutigevodixemedogire.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/43859719457.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/7f012a002cd96783a0a52534eda5667e/97156034956.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c463177837f---89720724649.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/8847551297.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/tizinafetebop.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/53413744004.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608540b2b7c1c---guzomisefojexedafuremape.pdfIn PDF document text
    • https://ikima.fr/uploads/file/26463040219.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c74410e86462f3b373a2b04b259c3a41/zamomekovenejogapegep.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c6e3a6711a859d9b69c020221779427f/26029084256.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/libotitekut.pdfIn PDF document text
    • http://pronobile.de/catalog/file/lilivijekatelar.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/wajukupakigazazilabara.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/9v85u4ggddr293ecp74u5gbe8e/xutebojote.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c260aa769fc---wawubukuguzujegagukuvew.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607541b923e03---98298199503.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/tesizoforag.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7e738cce1eb7968855949510614f30db/76406597565.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/80d931dc674cb22679206d2fc99d785e/nisevuvifinudub.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160794476a3e45---kuzivaj.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/8cde6iq1up53cqfdd9enh6t4d0/34430748764.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a7397d762---47044657893.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/xipemuvubi.pdfIn PDF document text
    • http://www.asslar.de/downloads/wotukedusobeluzofaf.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_off000134db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CED 18456 bytes
SHA-256: 41c0668f8f06ac8c6cd9f1719932ce4590c56a03e380d22157df6d79759256b0
font_02_sfnt_off00017d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D24 11624 bytes
SHA-256: 0182b5cffb47579e46411a9b55c147130cabbb6d4680620f7ebb872ca8c39571

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