Malicious PDF — malware analysis report

Static analysis result for SHA-256 c541d9b5d410abc2…

MALICIOUS

PDF

72.4 KB Created: 2021-06-20 03:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa0fb0630cb5729508e4777c229c115e SHA-1: 61cea284a6b7635f5884f97c2a73ea2fdc5927f0 SHA-256: c541d9b5d410abc268cce6a5c489f76e524d49bf918cd4f0d5e2653ef7b6d93c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b42762a6c6f---44867693069.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e5e75ddaa---dafegobonerokajenoz.pdf
    • https://metricgroup.it/uploads/file/86718238638.pdf
    • http://svazekobciorlice.cz/userfiles/file/84124319872.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21ac0b14e9---90431212840.pdf
    • http://adance0112.com/upfile/editor/file/5753396337.pdf
    • https://ascinfratech.com/clientprojects/trading/file/89223846113.pdf
    • http://akekaluck.com/ckfinder/userfiles/files/88350820778.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/fc8e0b9758654ed257661847f3f089e2/waketigoditaxepom.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/jmt4mh96skuvt7o0ckc2mlab3o/namamubakamurapato.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071da3a94810---fomupixozikatumibep.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/08hhkrs2osqt2e1j62l3hm8863/titatisekagulazu.pdf
    • https://navliecky.net/userfiles/file/peluvalikagudus.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5109366d20---34858952136.pdf
    • http://flatadministration.com/uploades/fckeditorfile/xamanawovedumekenawuv.pdf
    • https://hondamienbac.vn/userfiles/file/sumewej.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/7cb39efcbd4041b525bb30577429cc07/savimoger.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2221600f08---64266627077.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608508250b695---gimesevujeluko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=see+u+again+download+mp3
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ca.bin
4e76a5801ef098de68c2299845dc3475af9af7fe5f173b471321f33363fb2c4c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CA 5168 bytes
font_01_sfnt_off0000e258.bin
0bded8597a688d9b54f894c1ec0a9d185e896a82fa3cb20139bf9381baf754e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE258 10548 bytes
font_02_sfnt_off00010660.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10660 4324 bytes