Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa1a9276d4dd320…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 08:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d035333daf385174c05c2ada7bf5d37f SHA-1: ce13c1ffb850e5ce3b234650f793b4589a5a286b SHA-256: 6aa1a9276d4dd3206987bdf6b2e9a77d969efd029196a98e6db0dd95d66d3e0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or lead to phishing sites. While no scripts were explicitly extracted, the nature of the links and the detection indicate a phishing or malware distribution attempt.

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 http://touristclub.in/userfiles/file/60834416670.pdf In PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9tmji2nd1ak9if5ncqrr564uv6/92521478027.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160959b869cdef---tumopen.pdfIn PDF document text
    • http://clarasonic.com/upload/file/76534147116.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100f874161f4---33148757560.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/17234817275.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/lulozobadokezok.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/46956216186.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/puzosasagilesi.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/0761b45bba660dec6d89c5c7d491a1cd/funurolidupesov.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/850e1a2e9ffa119db1b022c2fd3c36e9/bajazuxivava.pdfIn PDF document text
    • http://jinxinghotel.com/uploads/files/tagupidigovuvenowivav.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b01b71f38b---36759289060.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/mamuwuloluva.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/funevixawugoxid.pdfIn PDF document text
    • http://njxinbell.com/upload/files/nawadujoja.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790fb47c70c---89798081301.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/5l4b2bi2bm9opdii0osu20fahn/27148891170.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/baf1b1d478fd13cdc2f9be5fc9673aa8/pobisajod.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ac2f8a7f7---46576131919.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/b5c2f4bbe2f4498384bc73d1cd9a3477/88354512547.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/kuxemeveropopov.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cc5e0a120f19cdc934edfabd3cf5a284/60820120720.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607387881a56d---67165775106.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/51477431999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=nwmls+form+21+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_off0000e6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6ED 17684 bytes
SHA-256: f3661cc29266d82e61fb6634d4c11e21c98c8b11df864b910115d0d8a800d70a
font_01_sfnt_off00011426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11426 10308 bytes
SHA-256: 2eccdbfe20bd8a5add88817cf21db248d26d1f45d9ae019ec976fc69a0eadadc
font_02_sfnt_off00012b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1