Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a511db7f96fd87f…

MALICIOUS

PDF

89.3 KB Created: 2021-07-01 00:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c9628dfe2a4484f121a8fba832180a4 SHA-1: d0a6702e809c26410b8806ecc6856a2daec99a38 SHA-256: 2a511db7f96fd87fa82f50ccf7ad0c6b4311eaa72a032c578de3d08c2af8e5d1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The presence of multiple links on disposable hosting further supports a malicious purpose.

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 http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/10b3ec4e752b69cdcca7eb6a1ae729cd/gexikujovivizez.pdf
    • http://bitite.lv/media/txt/122/file/pujilefapuledofenum.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/54be322b031d5700b4827d6b405fa060/pupulotaxikupemoxap.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831cf0d2f4e---vuxamititifepa.pdf
    • http://diakmelo.hu/ckfinder/userfiles/files/pekiretogegiliwufapukolur.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/fl8n8ngf09kmtbb3c7lirsth18/71599006730.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/5843fec84c88be8a9812d111c921d88c/18901005981.pdf
    • https://adian.eus/files/galeria/files/xilugupiroritezanebe.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f39421a97f---gegurodesirivakidewug.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/74885000040.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/d83a6ad57d8700e93504b6f238c03341/55535533083.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/d015b571dca6ce92b3e6d7923bd9144a/gikudajabubufimumokegipe.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd17d78b9e---kudebimuzezem.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/t09rrn6fif517gjdur1nam4aa4/4240905482.pdf
    • https://aradovan.com/userfiles/file/disijegosajareza.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/156looh72lcnfo4e510rkn8ol8/kafin.pdf
    • http://hzdsbg.com/uploadfile/1622506552.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/s7tegie6gsp35gb7jgv02eulua/15200335288.pdf
    • https://airshow-bg.com/file/54833303311.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/dqbqq7gl4mu3qdb9avc2er9m43/jisisaboninegubep.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bab8ac730a7---solasaxofigusubazigabejiv.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a62ed58e068---96948660135.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44a8dc04d9---48820273971.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=industrial+control+electronics+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f935.bin
a248a8a95bc4d78b8105ee10b7a3582aff6031512db0d99d869755e67538d6e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF935 10664 bytes
font_01_sfnt_off000111c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111C0 16792 bytes
font_02_sfnt_off000129d2.bin
f141445a43f9175d74508bd7a5eaed3d2f227331af30a9b527c6c4a840655b32
pdf-font-stream PDF embedded font (sfnt) at offset 0x129D2 17624 bytes