Malicious PDF — malware analysis report

Static analysis result for SHA-256 c188a44cc611a54f…

MALICIOUS

PDF

88.0 KB Created: 2021-07-16 07:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1358f10e11405d7d40a508bd65abb481 SHA-1: 3a453b951d5ac4c43563f2e7180006d0bc0eb5de SHA-256: c188a44cc611a54fefd86911031d34b99dd7c26551164b37c435c60a766ad609
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites through a link farm. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://cyklo-sport-servis.cz/UserFiles/File/funizinirewusopawalubigof.pdf
    • http://duralinealu.com/upload/files/76807652568.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/b1da58f264ee7eff68368aee4863b6d3/towuxevitila.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dc363807e---norupog.pdf
    • http://gastrotest.co/ckfinder/userfiles/files/83381009630.pdf
    • https://kund-in.com/userfiles/file/fojixin.pdf
    • http://pestcontroluttara.com/ck/upload/files/83875446683.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608053d8f3e27---16937433176.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb908d9e34---fozixopulolojiboja.pdf
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/34053255025.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f02b19de39---71711571838.pdf
    • http://gayaarchi.com/userfiles/file/20210714074754.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c39f3f79d23---numozejukaxubej.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/diq7p8ausbcj5escnvc9i755o3/66440845934.pdf
    • http://bosch-service-center.ru/uploads/files/womiwitoxapuxufib.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/f45a0932c65d0116d9e93b2d62edb102/52121075801.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bd380a84c---25315773617.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726e05a833c---63990403939.pdf
    • http://shop-cartuning.pl/userfiles/file/dosijawogaju.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/637193e1d292998a921e7c44bb8a6eee/12582690632.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075ca24cbe21---71113577666.pdf
    • http://www.aportecnica.com/imagenes/editor/file/54417583279.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+does+the+prefix+re+mean
    • 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_off0000f2cc.bin
7dbf63a63e8f7f964a51e456c12e4cd0cb8c2a5a9f26d8cfb89a78caa1fe720c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CC 10812 bytes
font_01_sfnt_off00010b95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B95 16792 bytes
font_02_sfnt_off000123a7.bin
d9738513db21251e4b69310a84ce6453a82ee0ac83814ba03495d69f2bca4aaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x123A7 18044 bytes