Malicious PDF — malware analysis report

Static analysis result for SHA-256 73785eb227d89e80…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 16:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c6cc92630425a19c9d7026185c1345ee SHA-1: 0e2ef92730a4d263e0e554f05cfdedd3c2581925 SHA-256: 73785eb227d89e808ec4eb25fc2511581db9974a82d83a6fd403eaeb389635c4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, including WordPress upload directories, suggesting a phishing or malware distribution scheme. The file's structure and numerous external links indicate it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smidgel.ru/uplcv?utm_term=turmeric+color+in+acid+and+base PDF link annotation
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079df369a5ca---35918258825.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/n56suvgqp9khm0bmv649jiq6eo/31580893718.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/97607370943.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/8892lhisqccvpvqv5fik6n3p45/50869893320.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/305rslssngp291vqb4pgdqsag4/xogumo.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/pelukakopoloximanisebin.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/zupeputan.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e54706c840d---domeraji.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/gefojanog.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/jovesafikopawatunu.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/pisubet.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/94196704115.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/6b50ec420cdf16a410d1628d240f06d7/vutimogegujafajupisomoz.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/gajok.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/48546878227.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/worolefesedekiwaresise.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/53617900948.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/48174769425.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/kidosapuse.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/b8ed4f3ee82f361a796792ee6c865058/warolabesaguwo.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/9482911247.pdfIn PDF document text
    • http://abwva.com/uploads/files/joxigi.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6ce02d0af---27100914343.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5427010ef---70996353540.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/5p2j3ee1fj1cj8f8n8c3ma1ac8/97541310063.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_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 10636 bytes
SHA-256: ca30cb510c663d489de7168fab7847eac133590d5cf894c4915ab317fb0c5fcb
font_01_sfnt_off0000fa68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001127a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127A 19704 bytes
SHA-256: 4ead06238e203d960f50c07540a8c3c243eb8846828e48d9b895e09e145a6f02

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