Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c5f1843c706122…

MALICIOUS

PDF

89.8 KB Created: 2021-07-09 22:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f359bf8ae0106b156659e3ee58fba679 SHA-1: 12f034c155d390247efb47b5c185db9e0544234e SHA-256: 41c5f1843c706122a80ddef91184b203d98a7ba488c10a9426d7a2c3ce125242
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to websites hosted on compromised CMS platforms and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://infrive.ru/uplcv?utm_term=prayer+for+the+intercession+of+st+anthony PDF link annotation
    • https://kuepancong.com/contents//files/lamaberemof.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/81202a9f83fb8f1dbc2755aad5ec9a76/52669904446.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/puketezopetit.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/0a0bc9ea99c1c80121dcf3c521545c02/zipopepomikojurixovov.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/84371948509.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/14394170828.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/530b07be155098280ea7284b59e3bc89/kewepevezutedoze.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ae9f2d750---letulexekavasujupavulara.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/vsbrv8k32vbpmog66gh9ra7l7j/posepolilufu.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/biputosotijakoreg.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/4445375390.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/6738532907.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/17050382360.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/86525052985.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/31d8ce5811a2af7f0edc1e99b5975663/50731067465.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4e1e6badd---79791009506.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/pupugowipib.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f52fc5783---dewetomulifobotol.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/49348054828.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/18444648910.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/sadidiguzinukes.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/33817317580.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/43847950125.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 17012 bytes
SHA-256: fd9827eeb24cb2f6314540350ffb5942bfa27e16ac797dfd2033a2bf59b53c37
font_01_sfnt_off000129a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141BE 10500 bytes
SHA-256: 8dee180f377c70033b3516ae16d02819f991d0b14103013c8b1f70cb567fb150

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