Malicious PDF — malware analysis report

Static analysis result for SHA-256 609620aedba96e57…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 07:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 99a185d39b88a4b7d7f957274bb54fde SHA-1: 823139b97ce5f40ee58db66ba80d75b6cd820f93 SHA-256: 609620aedba96e578a8397c2d794b79c10b2e660f4c9afdba188366bd3bb31c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely to obscure the ultimate malicious payload. The presence of external URIs and link farm heuristics strongly suggests a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://majubesar.net/contents/files/41196852080.pdf In PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/92313680244.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/53185760217.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/56928949585.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/tilisonoduwadu.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/45036553811.pdfIn PDF document text
    • http://tdbm.vn/upload/files/14383762186.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/iktsbfgcs2jhome1e74i8h6qv5/videxoxudevonedutap.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/wonumabusuvafono.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/mabixokodorawazoxenopuf.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/fapojotutuxop.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5158b7953---zefadakedo.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/1d3afb4e44297140b231a1dde5ff575f/sukizoboxuduxu.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612eed8595eed---71836776376.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/ddaea114e63ff79f33340ed6ca7ba73e/nigenipusigoseka.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/ronovijarenudavuzulu.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/vofefobafudinoj.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/tawizivelefonumepoxaxaju.pdfIn PDF document text
    • http://robedecreateur.com/img/files/48227604099.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/95697605623.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/pilixipev.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/36464999930.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/16422536618.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb8205d46c---32986999535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=cricket+game+download+appPDF link annotation
    • 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_off0000ddd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD8 18036 bytes
SHA-256: 8ba3dd9ff066cc96109b94e0c6e29fc8d5b3a3629e9f9c66a702d82f1748088c
font_01_sfnt_off00010c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C10 10900 bytes
SHA-256: b4804ba6f132f1cd61941ecb4e1ca62f285207c2e9ca91617978f78027dc3721
font_02_sfnt_off0001252e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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