Malicious PDF — malware analysis report

Static analysis result for SHA-256 098b3e94322af3b1…

MALICIOUS

PDF

85.3 KB Created: 2021-09-21 01:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2840647ceeb99d89804e63ef3058335c SHA-1: 391824cc92c0745e43983e67932c351529447422 SHA-256: 098b3e94322af3b108ddaaaa89dd7c4d6ad0aa51bc94baa1438a4b6da7ffe31c
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. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection, hence the inclusion of T1059.007. The primary attack vector is likely spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144329f11b8b---birawakeseb.pdf In PDF document text
    • https://kettosallampolgarsag.net/imagini_ws/zezuvumisaborew.pdfIn PDF document text
    • http://technocom.pl/editor/file/wifomukegobegisuzusumedaw.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/113ffebeb1eaee608fcb824670c794fd/57170825277.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/81881577330.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/37174033228.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f557d942ce---42369865645.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/fisazopeperiwevolomew.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/pusaviwanaje.pdfIn PDF document text
    • https://ocw.tw/uploads/files/mifajidobizofelixit.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/69058692575.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210916_104731.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/gikavafuririli.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/39413598578.pdfIn PDF document text
    • https://ubranni.com/uploader/files/kedijit.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/dexikowodipagabaj.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161409030e4c3f---rinogamoxokagag.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/xapabusifimoporuxe.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407fc5e3d34---rafelokuvefujuvijek.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/sibegewozakufa.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/60546740297.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/78393361347.pdfIn PDF document text
    • http://erdbau-rauch.at/foxebixuzovizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cheaters+app+for+android+freePDF 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_off0000e88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A5 10580 bytes
SHA-256: ac3fcc74806f3176bef3d70d2ab7a436c804430d6896b9f741e1fe4ed7babb3b
font_02_sfnt_off000118c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C0 18056 bytes
SHA-256: 8b88dcdee5ee857fa1cc96927e60894a5e845a2039481c262e91ac1a9fbeac7d

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