Malicious PDF — malware analysis report

Static analysis result for SHA-256 e043aa3c31fe61ec…

MALICIOUS

PDF

81.6 KB Created: 2021-07-19 16:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e18fa5e10c64acaf45b32d15564e12a SHA-1: 612ac7594ad92db875792430003640aab2656a6e SHA-256: e043aa3c31fe61ec7684911044b4843b75602dedaf7857fd6ea1a69ec0d6865e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The presence of multiple links on disposable hosting further supports a phishing or malware distribution scheme.

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec424b4b80c---xinezak.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/9uhccm1b78a1j80bjkh1difmf0/17948971867.pdf
    • https://prosaison.fr/userfiles/files/vuwomivefigit.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/fhca274lovhnee1igo3pvkmetg/19785135389.pdf
    • http://chayka-svg.ru/files/pufevajobaduxabadudugal.pdf
    • http://bassbasement.org/userfiles/file/32200873052.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/qpe1kn5qq5nnusa75eolagr975/tomajexi.pdf
    • https://somogyplusz.hu/files/tovabexepigesolovaker.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5f54975df---48841333655.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/026fuj2qkn1e6alrqnf05b9dlp/wiwuxixedakifovije.pdf
    • http://geniuschulatutor.com/userfiles/files/zimetosixobes.pdf
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/75dea02cc47d6cd17efa8c885ce8ecad/30084523161.pdf
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27506790781.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf828625975---rututanubo.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4cf02c7a2543b61ccc95482ca6bf1c86/gisasenabibevobaviboxi.pdf
    • https://mvpartners.be/images/uploadedimages/file/96088178783.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/076a874889f5c55b331c9887905acf7f/leruwolotuxafuwewu.pdf
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/farugonofo.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825ad761aa4---31467924420.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/9a85a904d75d86f72320895c2149dc49/dobejapifenibokexe.pdf
    • http://www.pattyn360.com/upload/forum/files/rodufevomexavunujij.pdf
    • https://tectrongim.com/uploads/files/jalopikowaguladid.pdf
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/xulor.pdf
    • http://shortguycentral.com/ck_uploads/files/10596876580.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=4.1+congruent+figures+worksheet+answers
    • 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_off0000d8b5.bin
39191acfeb21d0a035d00eea0e8cb9adfee160462245df5f268ea0db2138cf83
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 10948 bytes
font_01_sfnt_off0000f241.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 16792 bytes
font_02_sfnt_off00010a53.bin
b0557c24c15e07e5fd9688051085230381331da660afa9affa4a5b4f6d643477
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A53 17920 bytes