Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b49edecf9d2492e…

MALICIOUS

PDF

69.8 KB Created: 2021-09-12 18:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0e1815c0b75defa34590fa60b029ced SHA-1: 424b4b800b0a09ffe1d887cce0d024795c27b2a6 SHA-256: 5b49edecf9d2492e9690581447569959d5bd5624fa9954848c620cf2bb89f133
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://pistant.ru/uplcv?utm_term=fortnite+hacks+ps4 PDF link annotation
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/2b4494e44c2ddb28a80a9881f98446a6/98637059508.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/gosofaxumu.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b6e06f079ffc66db9ca663fb91df30c6/75826308383.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/28537730919.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/efd90652d5aa3b7f63fac819088ed7d0/83369952818.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/relivobamizoxiz.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/43965144130.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613702c9c53d2---38937601340.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/kuturowokitew.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/tajasitevomom.pdfIn PDF document text
    • http://fohow77.ru/upload/file/lupekumisewuzanosalusitul.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/82074423422.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/56416313098.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/58242285109.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/nesiji.pdfIn PDF document text
    • http://juha.be/_files/file/69522001096.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/d1e770d312765095d5e2719ca7e57868/60404721840.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210908102742.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/2830438687.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/11450815581.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/lowiselabatu.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///somirudogi.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/pibokadagivirutaloni.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/wepizev.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/sipimete.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/vuvaw.pdfIn PDF document text
    • 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_off0000b415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB415 10572 bytes
SHA-256: f774f4dab81b91a147361885bcfd057ef14f5dc48bf8efd65641cdec61f48bd8
font_01_sfnt_off0000cc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2A 14968 bytes
SHA-256: e9729244800a74c8292fd6c95de41285eb32a17828410d7428028ba6bd30c5f2
font_02_sfnt_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1