Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed91f6c67413e8af…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 05:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c32509a9ebac83984fc70b793bee4b88 SHA-1: 21b2d41c5b1ceeab38eeefe0148ccb0e32b6ab0f SHA-256: ed91f6c67413e8af0130ae675ab922898927258abc8eae06f75b92e4cd03c812
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the nature of the links suggest the document is designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://allytemp.ru/uplcv?utm_term=imagej+manual+cell+counter PDF link annotation
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/43578843625.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/68067410515.pdfIn PDF document text
    • http://yilip.net/userData/board/file/mixewovelamaba.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/59304605191.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bae4a0a2f12---77452136651.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/33060780328.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/71287851935.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f0485c7d2a1eac329aa401d8efc883cb/sipupajufevekogematojimu.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16074b8df97727---tuwanisowo.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/86a84a3db118ae97724e2870c90ea25a/potelotowanewugaxaneba.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/boketeridusokaxalevug.pdfIn PDF document text
    • https://raljob.com/userfiles/file/xoxaxif.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/xizenavix.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///rorosuravugonezopilupokuz.pdfIn PDF document text
    • https://melz-feu.ru/upload/forajujig.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/51jr3q10tb8qu5fbfvs4t2tn8j/66454854307.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608293df6dbb1---36741571024.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160953dfa340dc---zujowaxilipize.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/g3j0apvmnjnkbft2rejmop2j9a/sinufaj.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/binofaxol.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/rezabijasebo.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/98969355921.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_off0000d562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD562 17872 bytes
SHA-256: 866d29cadeb230a4d45d18bce3c1645ed6e156a8dc8a4902cda5e80848e9d0d4
font_01_sfnt_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C38 10492 bytes
SHA-256: 9be6d77c2bd0217fe1876428ecf5b062960970b42645e87597993ccdee6c150d

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