Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4a0c49510ff774…

MALICIOUS

PDF

77.7 KB Created: 2021-09-10 15:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9a0a7985346305f379bba40bb5e9444c SHA-1: 212b3b8b188800c1ef2a8121b387e14af05eb105 SHA-256: af4a0c49510ff7746847f06ad914043428c6633f2cc514da01a769e86aab075f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external URLs hosted on compromised websites and disposable domains. These links likely lead to phishing pages or serve as downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://drafthe.ru/uplcv?utm_term=naruto+shippuden+heroes+3+ppsspp PDF link annotation
    • https://epgeptech.hu/ckfinder/userfiles/files/dizota.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/37512953953.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/3e9717e664c702d8fee0f2ea1c4e9f2c/nadefot.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/lubasewutofaxi.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/69fbqprjinstb8b7t01r9sviqf/63822064811.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/nuvujadopipazoroniloz.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/kumat.pdfIn PDF document text
    • https://x-software.cz/data/file/18824727798.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/22e0fa619808ab09521984ba5862b205/75104678241.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1f4ef42f975437b7b6afb918dd67f316/34221309276.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/69079712049.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134037888011---11843826306.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315f8776da7---poluzubuxotibixumapama.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/76840223588.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210905_5CBF9DF734DBE98D.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/30905217252.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/53913637335.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/87012123266.pdfIn PDF document text
    • https://wineart.online/userfiles/file/40160643037.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/tilovinefidatewip.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/66127960795.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/13815291832.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/zasurivokofufe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb3d301c3---nadenaf.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202195144641.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c7fec2bc7---pudokixulavikimojepuzijo.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210909210307.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8afd985af---52131741375.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_off0000ca8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29E 17736 bytes
SHA-256: 9b85e0f6f5bdce83f551b4590b30bdad3d93861e27df1087c163fa3ef3095c4a
font_02_sfnt_off0001109f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109F 10692 bytes
SHA-256: d6a7196e3d777101b43d20a10ac2ef41cc3a1f24adcba1957b134159d3414083

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