Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb73ff87ec7aed74…

MALICIOUS

PDF

90.6 KB Created: 2021-08-18 20:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a54cfa6e02c79633a6b30b7ce9c7c7e SHA-1: cb458774ec99acef828d4e8cdb04ce043615fa91 SHA-256: fb73ff87ec7aed747cba99ded8479450747bf7c8c095748fe7bb776b7f0f10b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1077f2ee8b---gitufuwapobevawo.pdf In PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d776b356869---46222392047.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/dqdpsjgnhtglvboa60sb23lt02/rubobo.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/24516075263.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/3oe9fm4u62q2dimajl93uqdavd/36018405451.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/livujuwem.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/dalinarusiravuge.pdfIn PDF document text
    • https://tipresentoio.it/images/file/xonalutila.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/dusokurotepolud.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/324e13c295bd666f56db717230eaea19/37738381183.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/3b76ccedb951b95a4109b157d7914806/55302741139.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/felufobasawopuvotuvena.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b12e46e6ce---67789364359.pdfIn PDF document text
    • https://yellowstonewildlife.com/mojule.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/629854e742f262e2edfafa4101d0e3ff/xedaja.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aae7ab0e933f9429157ce2b77f5abf25/bukozagamo.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/31609254707.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/10931107297.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/xijedigig.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/ruxunatoredubomejamezote.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16075fd0ae0cda---77856314562.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/subalafobiturewiwu.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/bofugajutu.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/37305651938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=kingsman+the+golden+circle+google+drive+mp4PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 11096 bytes
SHA-256: bdb8c9a4e383433e46055b9ef0f9f44e5ce212f7af03bd1ac90b2f89ccbfbc47
font_01_sfnt_off000109b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B4 22240 bytes
SHA-256: 632d4fc1d4d4d57c587be03de8a856797862a4762af8da98419bbed2e91cc458
font_02_sfnt_off00014184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1