Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a536b06d6e414a1…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 17:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0ebf3271a3cd3dd556d6b076f1a9dd84 SHA-1: cc7c53ac5f712f5935d64fa2055055d815eed763 SHA-256: 8a536b06d6e414a1a7a938ace5362ff922c336824708242d95ed2dcee9961870
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that redirect to other PDF files hosted on compromised WordPress sites or disposable domains. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=john+deere+gator+ts+manual+pdf PDF link annotation
    • http://graham1978.com/clients/79565/File/janozedudawirez.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/ruxemosabogosarip.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/29f945e904040d027d3a4866dbbb0a2e/32425232527.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/moguginakadelefedewoso.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160883edebda4d---97152288184.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0uvc3dl5tetbsgk52mhc5ldmk/6127177658.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8065ce568---gerokuxasoj.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/uc4q0kmqct3bape0kefbuk581l/davogelodefu.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/73871717244.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/nurupup.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///zajabiranos.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44505045191.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/qttqf1lh3c0tq512epu426krk0/51147233608.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/18623204629.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b4cf3345944e2e0add9f55c652536aed/latamuvoxuzinukubuzewoj.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/neluvigekopogazat.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/tufuxukenekakivixemuw.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/25732714530.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608171b24bb40---xuvalamipop.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/1qub8op4eqi2a1h55bsjr4vjsj/fufanipemenitudibigi.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/mabizopuk.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/jamepasejedekolatadavej.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/futodobazesu.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/nitixosonibulif.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/zodizifovupun.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/xinutuxe.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_off0000d77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 17632 bytes
SHA-256: 37b69109e00dd15819f44a1fa7e4a8c7071a522d2b908af7c971e997a44c2ec7
font_02_sfnt_off00011d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D90 10944 bytes
SHA-256: 92b563f83c00fec1b77b5d185234eef78daf14cc7aa7ac3df91e1830b4e26506