Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfd1dd84f71f84b…

MALICIOUS

PDF

84.9 KB Created: 2021-08-30 13:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2fb7f6bdf1b3265c8c2ff6ec2b87ae40 SHA-1: 011ba6a2ed86e4d479c530a74bb8da32a584161a SHA-256: 7bfd1dd84f71f84b35655131b07dbedaf2562bc1890973a176da7fe19eb65cb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The file's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/8346d9345c5a7815f705f0b9453ffa61/dofewesi.pdf In PDF document text
    • https://amd-export.com/site/upload/file/44606001107.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/23038266257.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e696e5f08---99585841476.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/lorebadevoretu.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/cg3hllvteiiptdqdmcur0h4q59/dugur.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/93094302742.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607507773e91d---sekenixomofe.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d971e6e1d8---lenolen.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/xozozes.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd8e3967577---xinojumotewanopod.pdfIn PDF document text
    • https://ketoandongnai.vn/upload/ck/files/nometojuxazinumigi.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/mozawobebuvobug.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/28238340387.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/supolofijejofusudiboj.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/xubupep.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/gakodilibev.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/ebf211968187c57295a852ebf4c84c4f/rifozabejebeg.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/5b2131c1c0e789d36e84db0a7a3c1f98/15968652200.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/7022990633.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/depujotugajedanujaz.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/pegaxor.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae10cd91f5b---ronevetivewatunuxifaka.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zokagesinakewaxuzivifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=father+groeschel+rosaryPDF 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_off0000e6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BE 10404 bytes
SHA-256: b3fd660fd450d218d3018b416dffa60e1f1a281e278e395574b6f391404416e5
font_01_sfnt_off0000fe82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE82 17672 bytes
SHA-256: 88eca6a4cb4d4966e6ed6bcc3d5369fb8bad0bd47fe39aeadbe3b8a370611057
font_02_sfnt_off00012c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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