Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a21fe4d19945dae…

MALICIOUS

PDF

73.3 KB Created: 2021-09-07 07:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df29b2ad44d45e5fb54d9d6ff59da947 SHA-1: 956cd150cd8926388682e56898f36cd7a59aa296 SHA-256: 4a21fe4d19945daec355a6e82995de6efbf0854e46c9d10174671907292ef1ff
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback lure, prompting users to call a number in a billing or support context. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious sites or engage them in a social engineering scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/9ca3ef7be8c6497dcc9eb3f2774165c6/welawipelifafapavagidene.pdf In PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/3h5pq4a40rngrfa3uo742vpbos/27584448535.pdfIn PDF document text
    • http://goref.ru/files/file/sutonuxefoxunedijojo.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/69726397079.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/xobiwub.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/61bac9332b2752011a4d43dec37803d1/93817104285.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ijh5689qgd0s96ufnh2kee93q7/tubinaxolamudaxi.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/dff35e48825f2c6e63f090ce76bb672f/wufofutukebakotugene.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf19159d2c4---dupunoli.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/tebopujemajuzoxe.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/bawodiwowunavewow.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/74c637711ca07e0fde5be38561dc37f5/64650024948.pdfIn PDF document text
    • http://daycamhoa.net/upload/UploadFiles/files/worowifefilofuwo.pdfIn PDF document text
    • http://www.bandungmesin.com/file/14428800950.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/31470629303.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be7d70dee62---gerogepidilixuxi.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/50571046251.pdfIn PDF document text
    • http://bjallstar.com/upload/file/nudirikawawavoba.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/fd1ec90f7bd56cc01ca14236cf28a0ca/65393623655.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/ruzobaroso.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c572a6c25---90766371947.pdfIn PDF document text
    • http://faxik.online/ckfinder/userfiles/files/kasise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=mobile+computing+syllabus+pdfPDF 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_off0000b8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F0 11212 bytes
SHA-256: f745be6491c8b5c47fa55cc027860a5fef8323a1d2f28402665b94b950b47b4a
font_02_sfnt_off0000eac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 17600 bytes
SHA-256: 1edf43e8e038befa897489d6d6a2993844b7bd3266c4ce9c5d7b934458156bce

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