Malicious PDF — malware analysis report

Static analysis result for SHA-256 94894cc3a247c4fa…

MALICIOUS

PDF

83.8 KB Created: 2021-06-26 13:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 384e95d7ca72553460082bb81ec9bbdd SHA-1: 14986952d83a588742b498643de2b6444c4bc28f SHA-256: 94894cc3a247c4fa10282ae751c6be5864c7e63c020851c36dbfb267c170b330
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to facilitate phishing attacks or distribute further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://allytemp.ru/uplcv?utm_term=be+overcome+by
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921748647f0---55989277772.pdf
    • http://timavoshipsupply.it/userfiles/file/dexeku.pdf
    • http://dissanna.com/temp/fckeditor/file/fajolidenoza.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/tq7q41qhj0ielqgpccqjqqsup4/wemigumujaxibelulojifilej.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89dfea960c---15819301397.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160799794f056a---352398224.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a362a6763---fugaruvezujiwisemenexux.pdf
    • http://candientushinko.com/images/file/wuvevixado.pdf
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/84250021337.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/suveruduvibigu.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/e7t4ntc0gqrq93gbv6d6nalpu1/91632920315.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ulfbinof62n9f1i5j2us3mn9k4/22328553286.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/275a7b5b69007076d8f609d24eb2696f/18983207337.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa51782b6f---11818926942.pdf
    • http://jedwines.com/cmsCart//upload/file/fatewivubivovasel.pdf
    • http://anhbanglaw.com/userfiles/file/83697621065.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160859d5d88d53---95167405700.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e75af57caf4735aede1a70e734aba328/raripabapag.pdf
    • https://baobihungphu.com/media/ftp/file/95743240316.pdf
    • http://champaigncursillo.com/userfiles/file/sewemobetaxupuxoma.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a37b52bbb6b93ed53a0b90c93f4b7bf1/laripegoderarad.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a47fb51a5c2bc33773c1f5c83b9b116c/70537251139.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbe4.bin
e5ec74c1c82527c95c0b6a7ddee31c57258a0b263ada37b6fe1aa58b02958c6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE4 10092 bytes
font_01_sfnt_off0000e270.bin
8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825
pdf-font-stream PDF embedded font (sfnt) at offset 0xE270 16060 bytes
font_02_sfnt_off0000f77f.bin
66661a65305d3d447b6c76a0c920ce20c7683321d321b6fdbaf323af92cf97c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF77F 20052 bytes
font_03_sfnt_off00012a4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4C 16792 bytes