Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8bc5e40ad2564fd…

MALICIOUS

PDF

73.4 KB Created: 2021-09-21 21:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f821e8f6da7349898198d415e18d24a9 SHA-1: 6d096d0edd8f02c810633c24c9e1497b35cffbba SHA-256: a8bc5e40ad2564fd2b35a800ee9540ee2cc337b3d87263985b74965e66614df0
154 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 and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6736

Heuristics 5

  • 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
  • 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://pistant.ru/uplcv?utm_term=tutorial+de+android+pdf PDF link annotation
    • https://beauty-full.ru/uploads/files/gomobesunuxotufaxure.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/18345667713.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/41674188756.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/o7ea205a1q9haj2sva1q8mq9us/vurulibitoxux.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/limoravewudarovute.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfe34ba063---59100017558.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/69e23b34699b83d398b64dfce6877c6c/lidujodovadupadil.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/47222801749.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/39870574405.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/reragazasowiwujulubejuwe.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/fexofabemabofanoxaxagawuk.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/notigezojimurofevabif.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/13254985745.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/figimevazafofegokibenu.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/zodavovenajebukaxuko.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/94810805008.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135448b531c2---kopukufupisox.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/56400245232.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/13907162022.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021090603534573499.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/koseben.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0C 19508 bytes
SHA-256: a9a49a5c620dfceea69063245a813bc782caff0459c5fa13f25850406dde720b

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