Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fe19ba0686e3c4…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 11:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19c4d02059c88cfeba58a51ab0729294 SHA-1: 87784643e93f44b0021b6cd805421988f72078f9 SHA-256: 75fe19ba0686e3c468ebe503bdd4273f1067456b78e94d90f9f1b63c4b3afa09
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on domains identified as disposable or potentially compromised CMS upload storage. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The primary function appears to be directing users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://cga82.com/admin/File/nesegagubadipuxozugover.pdf
    • https://szekszardportal.hu/userfiles/file/jakotojanoniz.pdf
    • https://projetounificado.com/uploads/files/vudajufopikokudexopeba.pdf
    • http://okmarin.ru/userfiles/file/vilisenetizoju.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607248ff79954---pexuzarimabisujozamu.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/nkd79eudc8alpvo5e2i60b7m5d/xafekizafe.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608033c73647c---tizaju.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/ed246697172921beff01a6e98befdcf1/92765411024.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/6c9f026f3f2bfdc1b9592a117b8c98aa/35148338069.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84ab040d3c---70925863290.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/7us7huqar72pcmqke3nal5bme5/48930765279.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ad33edd8ecf7e9d108cfd50cf297841b/miwejujuramasajeboturokub.pdf
    • https://fundreamz.com/ckfinder/userfiles/files/fapejinebozatuxusum.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2902388feb---kofizajopir.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083b0d20ef93---4230036695.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1ea9efc97a65541dd80d908548cfa551/vamamevipadafowul.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada965e2b70---lefevuwakim.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/3c67b1d0a9168c8348cf63c4d3095d5d/xabimekideribosezeda.pdf
    • http://10glazsikeyrosa.ru/file/58075119928.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/44npg8hhvnsdlop80q0b06mkap/83020782036.pdf
    • https://alihuata.com/userfiles/file/zukikegaz.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767e6f26f20---63122178733.pdf
    • http://blpest.com/UserFiles/file/mopafejewinilol.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/jm857sc0h9r4lj9qk9ccvn8hq5/kulukofosi.pdf
    • http://maychamsocda.vn/images/userfiles/file/97699305988.pdf
    • https://theatresaucinema.fr/uploads/file/jenokibuvekupajigare.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=meaning+of+wheels
    • 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_off0000f11b.bin
f395d0f30cc4646c8142c95fe5d4c4d0d5fa9f5552a6edca00c69c72f25b1de1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF11B 10376 bytes
font_01_sfnt_off00010887.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 16792 bytes
font_02_sfnt_off00012099.bin
c53588d98b125e1ae907a74a0fa3140eed855278ca2b5ef252b5342031b9857b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12099 16452 bytes