Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7fc00a4b3e235b…

MALICIOUS

PDF

87.7 KB Created: 2021-06-28 03:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fb3a312b422802805e9aeda20efad03 SHA-1: db77d900a540894776d981273e82f103041594c9 SHA-256: 5b7fc00a4b3e235b552d77250764527624d76b5396023e8bf7b23c9b16f3c05d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or malware distribution via these links. No scripts were extracted, but the PDF structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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=20+minute+yoga+flow+for+beginners
    • https://anmimar.com/royal/userfiles/file/42482553364.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c616265fd3---rujejozamavawuge.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608488f2a4f21---zafabolusetozotetalasageb.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16093944a9eed3---76553107267.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160727faa96898---6639834263.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b3c514385e7992ff325a211896cad342/pudutelalorikokagadi.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/85047858027.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce03d539943---wedekilonumuzo.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/40528a448a57911e9c86cf76d02ac9b2/12162024507.pdf
    • https://jerseyshorepirates.com/userfiles/files/33073481677.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607554e6304c1---bunopip.pdf
    • https://emmaushuis.org/pages/85113352969.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160881b87e16f1---koxuderutewale.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607248c0d2b34---tetivutujedavevifoz.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae8ce062ce---7778675245.pdf
    • https://educationindiajournal.org/ckfinder/userfiles/files/66366881750.pdf
    • http://yavuzselimvakfi.org/resimler/site/files/viwigeke.pdf
    • https://suma.ca/upload/editor/file/20465519036.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160839c576fb74---giluvefuti.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16079870375bbf---favefemij.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607161f47871e---99738280988.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7a4730860---93584039759.pdf
    • https://nhachoxebus.com/upload/fck/file/gulejakikizutigub.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 16792 bytes
font_01_sfnt_off000109bf.bin
5c0aa6469c65bc3ae593466bd022afd8a096358a989d249f89d7d01283b648ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 11144 bytes
font_02_sfnt_off000123d9.bin
529b4ad1d2acc262577018e31dcbc23f1df4089b33145ba5a01ef5fcb0d8a9b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123D9 17336 bytes

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