Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4bcab541e104a6…

MALICIOUS

PDF

77.3 KB Created: 2021-09-22 19:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 87aba87b44add4a52920c85ec07adffb SHA-1: c66d54c1d785c05a56d3996953d0a4912b13ca9e SHA-256: 8e4bcab541e104a663a9957c9422ee19fff0f0e274114e41f6d8acb0cba9b2fc
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 disposable hosting and are part of a link farm, a common tactic for distributing phishing content or malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://immobilieninvestors.org/userfiles/file/4575779679.pdf In PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d36725edce78df24fbbf070c4150af13/17266416751.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/36903909141.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/cf9e716d0e300e272354861b4198da0a/fumagotivovavatalubejepa.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/51738193920.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/14946053359.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/24696407639.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/44504928036.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/fezubanosademojarogawesu.pdfIn PDF document text
    • https://kaparatt.com/images/File/21098071635.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/vawudenukujemejuguzejub.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/48873867903.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/simevabuniwurosude.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/nisisekijafaxogaloz.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/pakevat.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5514eff4310369c4f4888f02a6961ef8/kisatijevuzobojo.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/gusexoreruxuxujun.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/regokifaporefelidiwamimux.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/tt7ud3jv8o51ila63gal2befs1/dufaluminoba.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/36349726025.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9f7c7b84679af81e0d1a8fb9bb1f83ae/93939835910.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/71113257612.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/57027356975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hueso+maxilar+pdfPDF 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_off0000c9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 10652 bytes
SHA-256: c26a12b4d9be20bd460812b05e2e314ec648897fe9d8c3dfff4c150ac66e8761
font_02_sfnt_off0000fa4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4A 18028 bytes
SHA-256: 138bcd5e025407cefdb2ec9b3a3d0d0c5a54806145689fd549e8aac922fad279

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