Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53ab6ae8ba0117d…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 22:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7e3ef71b7a846d0dac5cd3f1c0104a82 SHA-1: a04e843b7974db87d5b7eef60af687c304098f9b SHA-256: f53ab6ae8ba0117d9c1e225e28ef896e81bc0f1aeab2384718fa2abebf4d5971
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress upload storage and a payment redirection lure, suggesting it's designed to trick users into making fraudulent payments. The document body is heavily obfuscated and unreadable, but the presence of numerous links to potentially compromised domains supports the phishing and redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/scss60175nff9racif254vk41s/befarisufuxasuzupodoxeb.pdf In PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945e10b2656---kokixugopepinavaxunafa.pdfIn PDF document text
    • http://rc-modeller.se/images/file///juxarekexax.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b7704969b70---sadabaduwerovuviliki.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610eeac0c9d1d---legevone.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/mexuvomekigarebope.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/zejelela.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607828dc043a2---97021058976.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/sarewuxobawuvawavere.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/67651968770.pdfIn PDF document text
    • https://wittnebel.dk/file/sozig.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/bafozasidegotibipixijejig.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/12273366080.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/75157908744.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ptmrfj0br6e81d145vvgv2ecbt/1026757830.pdfIn PDF document text
    • http://myslizdrave.com/soubory/75291422073.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/dujuwiramubegexi.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/4a3a14e4e179dbfb02d3b6c7e6823e7a/72964263351.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/beramilifeguwabarejanunum.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/letopotinaresim.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/26614780007.pdfIn PDF document text
    • http://grabnerestriche.at/29094610150.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/83979987953.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/32f5978c873639058aec0aafe5903346/40190385185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=save+file+as+pdf+onlinePDF 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_off0000e22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22E 17308 bytes
SHA-256: 68b5c19f706862f689126eed449a11d36e2e571a1e4c735a6235f856aeb554ec
font_01_sfnt_off00010eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C9 10436 bytes
SHA-256: 5f9299bbf619e96c16ec1cf7307438556101114bfa872e5e1e6cc06c7294dc14

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