Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1931672d0305a6…

MALICIOUS

PDF

87.0 KB Created: 2021-07-28 08:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4470575cb065ca15be9d63299a2ae28e SHA-1: ebf179c6b26851d6f83f8d62212ff00b60fe5c8c SHA-256: 3a1931672d0305a66876c4656cb37f9cebf60cad25a4220286ebcd5dad663980
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as hosting for further malicious content. Heuristics indicate this is a link farm designed to obscure the true destination and potentially exploit vulnerabilities. ClamAV and ML classifiers confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/2qafodslj8bm72570p1n95n15r/wetupakaxusupomulebibuti.pdf In PDF document text
    • http://deauville.ru/files/file/megexaxowetogesoxaduvixex.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27a71494d3---68802461101.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/12d251b2537a91a79c948679e8b79ae3/javaguduvajikiraferatimo.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608d30dec9c8b---7360236426.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ec274802349bc71b8cf13ea7d53789c1/divoderexalizodajituzeta.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/f1p83djjv07m603n8tapvvojrh/zetiwidoxuno.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/goved.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/bevobajipubegewebunaj.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/19576048617.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/30742561268.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/nidenonefu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8034372fe---18622987406.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/38150773126.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/9tsqccqduoev2uq550k1kmbk1a/guzogifaxinepul.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/1019320187.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/f3bf87ffa36a58ffab7109c6ac793240/73543607740.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1cf4cc9a---7354010293.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/biwalelofufanemososel.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1427cc39ab720f69e875962a9554284b/95611122310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=maquia+when+the+promised+flower+blooms+full+movie+subPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f0b7c45d444d4feedcbef3009e00a110/fotusuziror.pdfIn PDF document text
    • 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_off0000e939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 11296 bytes
SHA-256: 1b588cd45085470a2de4502468a96edfb87840e501005d34bae7d2b4ef050a6b
font_01_sfnt_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 18548 bytes
SHA-256: 86541124cb2a34105f95b0729b8b1932f0636905a8699fb0a5ddf9273105aaa6
font_02_sfnt_off0001337b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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