Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21af8fc6a00f9a5…

MALICIOUS

PDF

81.1 KB Created: 2021-07-06 13:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ad3f3b842f39937e5958d07521255f3 SHA-1: 2369485c8aa3d34e6334e6e12e531d80ae197c8c SHA-256: f21af8fc6a00f9a506c8c648b948b43ad859855476a462738c84a12ada086deb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://zahradysnapady.cz/soubory/files/kejebazamipulipexigo.pdf
    • http://bogelaipigeon.com/upload/file/denexaxifonugawenij.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c80606ebd---mulefexuzokasufovatot.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/e95ab9fbb6b72146641a47bcc446e000/93024330090.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7dff44b51c733da528b85e58b44e4c6d/rafiberogubigufodixub.pdf
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/refitugezisorap.pdf
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/fiwufeseravajijovaposas.pdf
    • https://itchanoi.vn/uploads/news_file/jawagidazawojage.pdf
    • http://polkovnik.su/upload/file/zinazitomazi.pdf
    • http://bannermaul.com/userData/board/file/besulogunazenogisibarovuj.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fab3e052f---95804944048.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/dd6eb282b6f1ec504b125c67bad20cea/nokezibagutopelimix.pdf
    • http://codienlanhminhquang.com/upload/files/fumojuwalazobadepi.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b800d06f07c---kolaw.pdf
    • https://zapcdn.space/web/img/podborky/files/lotanipij.pdf
    • http://xn----8sbosgn1al9i.xn--p1ai/ckfinder/userfiles/files/lokezizavavifiwukud.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/253e951eecbd2b88b3312abff66de348/15553259705.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/6n1gtiege906fdkjnumr70bh8g/zujabirus.pdf
    • http://helloshoppingnepal.com/userfiles/file/38679294698.pdf
    • http://hrdiborice.cz/erucom1/files/files/61031109641.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b1dfba5adbdcaf1219ad87cef1f40687/18665036454.pdf
    • https://leganordavigliana.it/uploads/file/82242967468.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=xing+events+gmbh
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da59.bin
c17cd1548e5a14f03479ca34f7458dc3d30197be977ad2f1650cd5a38c3cf60e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA59 18252 bytes
font_01_sfnt_off00010865.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10865 16792 bytes
font_02_sfnt_off0001207c.bin
dbeee041d67df9901b1b06849721c6ad8287241fdf606b47a27406feb0845a24
pdf-font-stream PDF embedded font (sfnt) at offset 0x1207C 10340 bytes