Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b5d4a9a5858461…

MALICIOUS

PDF

91.1 KB Created: 2021-06-13 08:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec39ebf1b9cee697b852586838bf45fd SHA-1: 07fcf2b13be8f1de50ec27c505608903cbd2e742 SHA-256: f8b5d4a9a58584614025f837af9061d04fd3c7246c3e94f91b980902e12f769c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6844

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://crewmak.ru/uplcv?utm_term=complex+line+integral+solved+problems
    • http://sitoad.com/bbqjoekey/files/202106090504117228.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607af2210a260---46863685107.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094da43686b7---ganisalevibexixatavok.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cdebe0334---zazuto.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072e42303b6b---pemaworitapagi.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/e7cb4f93fa039f3fe876aba2fe294fa0/32016604419.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/7um3tgru8so86nas9dbpqu3qi0/3895848918.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856ee3780fa---bonamefukebokipakum.pdf
    • http://ottotech.center/userfiles/file/tuwazafovijiwo.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/06f83cdc1aef6954054517e408bc69b5/1884536199.pdf
    • http://goodslib.com/userfiles/files/konorikewozukarumadu.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609529820edf7---zivibefatibidinale.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160856119e99f3---68890009652.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7b2428e32---pazeviseri.pdf
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/nufomipukigibuwibebe.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763dd1488af---bevuxixedarifulero.pdf
    • https://unosms.us/userfiles/file/fetajeduperinenewe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL
    • 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_off00011c58.bin
3d5a558ceff96dbb8d0a038423c64b5d927e6dc6a3e03783511c05347d9176ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C58 5452 bytes
font_01_sfnt_off00012eca.bin
4c56f1bb0e49887c9e706afb1c7398696bd500fb56d0e9159996801b3b33622e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECA 12480 bytes
font_02_sfnt_off0001590f.bin
c1b5a291ed10d0d724d3422df82248c6b61960732476a5a833006cc543b6c834		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1590F 16544 bytes

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