Malicious PDF — malware analysis report

Static analysis result for SHA-256 779f5e1141b5ceef…

MALICIOUS

PDF

83.3 KB Created: 2021-08-12 22:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7741fef41d123727fd32a08cb4f1b0fc SHA-1: 36e0b2ec39b9c2ec99189e4acea376e0a22075d8 SHA-256: 779f5e1141b5ceefe0c116d3d22ccbe55b5fce322b5037d60be7056cd3e88bdd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external sites, many of which are hosted on compromised WordPress installations or appear to be part of a link farm. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to prompt the user to call a phone number, a common tactic in phishing and tech-support scams. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dpsszczytno.pl/photo/file/68287037796.pdf In PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/pibusopomalib.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/19753305438.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90a9d95527---69324214503.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085820fa0d14---82950618519.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/sitovajumukovajutu.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210710_082827_125.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/temivumepuxulamifugu.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/17444763701.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/vuwemefinejepejo.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ec1e8cb6e6f715b48c0fa54420da07eb/49622013075.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/2f489b87417fd4a4c070782043bf3eb1/36237515969.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/vuvaxinaxalujageveposa.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/74066942692.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/1302955370.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff0e1248277---fozalakupura.pdfIn PDF document text
    • https://xistenze.com/files/files/xovadonorasese.pdfIn PDF document text
    • http://haworthclassof73.com/clients/73472/File/44663426660.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9aab64b8f5b93e05558bab8fd5a97fc8/29395144824.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/nuvikimesoteziv.pdfIn PDF document text
    • http://aps-mes.com/files/file/59855660195.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/85150951776.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/33157491690.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/29576912024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=random+phone+numbers+to+prank+call+usPDF 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_off0000e0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F6 17176 bytes
SHA-256: 6537cabee9e80f4d30d26223ee782f33354e84dc59df165161b25b58aff63a9a
font_01_sfnt_off00010dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D8 11064 bytes
SHA-256: 54c4585886f6c3d0ba8762296565cc964e320e222092ac92c3608ba9a3856179

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