Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b308e5d8e281c0…

MALICIOUS

PDF

87.6 KB Created: 2021-06-25 02:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a975e34e254479024c125bef4b2283bf SHA-1: ae2163d30996fcb7baed35db9ee3df555dcb6903 SHA-256: 06b308e5d8e281c0a15c385b256953e390d727b1f349637d585ec1a06668f8bb
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous URLs hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and contains metadata related to its generation, but no clear textual lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://oniceh.ru/uplcv?utm_term=skoda+superb+manual
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/452df7b011bdd844b61be11596ce6cec/fizadigasutelorareropov.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/o9p5o7gpni6ek7ak79t0j0d576/vepurokimiferewilisirimis.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758d9059295---13803925248.pdf
    • https://radmangroup-ye.com/rgfiles/file/gofinelapidule.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609671ab64ce0---govujenogopil.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qjk5b9s5h73hi7h0j9tbafe7k5/judamikalepelovisejazided.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7056807ddf---voxenevupev.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afa8e219422---75366273504.pdf
    • https://bookatowncar.com/userfiles/file/lexonamosubifitaromeruxug.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/vosukun.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083d50729c93---10957467903.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3d5468034---nonowevu.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rqjoaidqbn3jera5fp1r2qi7q6/50700846095.pdf
    • http://www.bufolari.com/public/immagini/file/soguzepifi.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/3e661b6d43d7258c4d2f2f3d996b9552/53369826103.pdf
    • http://piqiso.ru/userfiles/file/pafugebowosera.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/75e7a5033aefe4d8d4fc8f3a4a992f8d/5599589166.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • 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_off0000f286.bin
80f13e5def898a10a9204fd58536acbb2dd8d553fba4f5d8b5a6038a584dacb0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 5412 bytes
font_01_sfnt_off000104c9.bin
915f6f9e99e214de3475ff13e53e40e7bd498cee71188fe42fdf137fce8ffa2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x104C9 5024 bytes
font_02_sfnt_off00011293.bin
dcba5fd9815fe947aafdaf18157670d34318fa37b1d84856928b58b285db6998
pdf-font-stream PDF embedded font (sfnt) at offset 0x11293 11780 bytes
font_03_sfnt_off00013a08.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A08 16092 bytes