Malicious PDF — malware analysis report

Static analysis result for SHA-256 35969ef921601c09…

MALICIOUS

PDF

78.4 KB Created: 2021-07-08 02:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9b0fde40b9dcb4ee34b924d8b1cbd254 SHA-1: 9848c2f77e7d26cddeaf0130984e992b1c34fa79 SHA-256: 35969ef921601c09b520a36491d45aff910094c4c25b7b2f8eede3169434955c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://areicon.com/images/file/394473425.pdf In PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rjdfknb6tjhshapclj167roqj6/netan.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/68115238635.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/mogapusegemazenaxama.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/degewunisobowijapimob.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/86323981285.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/tezubavivazonejika.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/98162668456.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/71144002735.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3d876036f---miseram.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/80073520573.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/28978350795.pdfIn PDF document text
    • https://chp-travel.ir/data/file/57501291676.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d3lr1t14tr54fff4l71cb627u1/dupadofevaxoxuf.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/17629677079.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/sb13t447eren0hdh33erk5pv93/77227214867.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/62959745627.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608313f67d6c3---93561211121.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/5149921659.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078237643667---doxapakatuwi.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/tovuzulezo.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/v8dt4n3vc9l88o9lt4ajm7ge85/fujejalixubomik.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/bodutinerepiz.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/fue8b2c8u35l3d343lct51kh5b/36723682643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cast+of+victorious+freak+the+freak+outPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/ludevaduwet.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_off0000d105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD105 10572 bytes
SHA-256: e3215170685247a8112a8421c8365448c07b2701f17eadf6073b21f4e7178685
font_01_sfnt_off0000e96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96C 16308 bytes
SHA-256: 90aebe37d90430a4358b061d51be98a6c0e38836c602e6c0443ab9a6fc2a41d0
font_02_sfnt_off000113d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1