Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1344b6b2c893fc…

MALICIOUS

PDF

96.9 KB Created: 2021-09-04 16:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 191b55f0f9fa3b2f11413276f8e6a0b7 SHA-1: 23445f074f9604471dfa8b7f3f30cc099cb6b239 SHA-256: 2f1344b6b2c893fcb65466929d33674ddbf74dc77e184bbb182bf7904ee299f5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.ecvbrass.ch/user/web/file/74570028526.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608352c7cec47---xuxux.pdf
    • https://rocksoliddesigns.biz/userfiles/file/jerutalixamomevunudawu.pdf
    • http://neodermclinic.com/file_media/file_image/file/wigovabiwisonidufowu.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/fef9708c7ae49fadd8ae5f4f3e4c8ed7/zikokabarasixerupatuxuz.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070390183903---fenuvubudupepenupewita.pdf
    • https://lmbri.com/WYSIWYGImage/file/dijazege.pdf
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/nasedadazunufesivebij.pdf
    • https://banderlogclub.ru/Files/file/mazolaniropunul.pdf
    • https://curewelldiabetes.com/userfiles/file/pijowununezeteposutuvuza.pdf
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/33267564718.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6ef87d1a6---51165243351.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/29e7cdb453071a233f45390adf0d9a33/61122906215.pdf
    • http://tano-cable.com/d/files/62798029558.pdf
    • http://chono.mn/uploads/userfiles/files/forawuxelefitavafew.pdf
    • https://himalmanpower.com/ckfinder/userfiles/files/91076938644.pdf
    • http://mail-business.ru/uploads/file/jikexexajawigidete.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160946de9f2979---35120025160.pdf
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/56806190657.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/5144897831.pdf
    • http://maduraigarlandshop.com/userfiles/file/kafofibaxasemejirimoruwog.pdf
    • http://uchid.com/uploads/file/63933990438.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d437789373---roxewekixojitaz.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73e7d7057c---makegimuwikupajipulaj.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16112548ad5148---99091312860.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=daewoo+lanos+2001+manual+free+download
    • 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_off00010d39.bin
9d4b8911c50511c2dbcdc9074c9c77718768c3c5eca585ee0fe457787cf923af
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D39 10808 bytes
font_01_sfnt_off00012644.bin
93a226c2a93fe287558e5df180af1d51f718bd1ce0ec212b3d27e1dfc73c779c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12644 21136 bytes
font_02_sfnt_off00015e04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E04 16792 bytes