Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f818741b10688e8…

MALICIOUS

PDF

71.6 KB Created: 2021-09-26 16:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bc861ccfbae2b5e1ac5ff00b78976bd5 SHA-1: b47210a4a67f46f03817ae4e283d91a7ff2a97df SHA-256: 9f818741b10688e84fad78acd0d9736dc93e290ce02dec418a46761253a5d094
156 Risk Score

Malware Insights

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

The PDF 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 CMS uploads and disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://infrive.ru/uplcv?utm_term=what+should+you+eat+before+a+morning+workout PDF link annotation
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613cab410d345---30772993865.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/regakitu.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141105017f1e---porajewamarativogurinopa.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/62610586315.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/lomutet.pdfIn PDF document text
    • http://cellfruits.com/ckfinder/userfiles/files/28271320600.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/13469749709.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/54974620343.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/telulamobesitugululid.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/78761696032.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/6673182595.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/nuzugozada.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/kiturawadogogeral.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/30223146797.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/pedumopageteruxaw.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/8fd39gmh7ltco98uun2i1oaef8/65261481659.pdfIn PDF document text
    • http://tallygroupkwt.com/uploads/file/91963352053.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/26265331194.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/molijiremunatokuwofobubiw.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/godopotiv.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43931360272.pdfIn PDF document text
    • http://spakimthi.com/upload/files/nofiginolisix.pdfIn PDF document text
    • http://btfa.tw/upload/files/gopinurolukaropobam.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/86603585069.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_off0000b105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91C 11328 bytes
SHA-256: 1a3239b69c5a76363fc7d2502da1b2429e6b6ae97cc4808ea07b5d4bafb8819f
font_02_sfnt_off0000e370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE370 17084 bytes
SHA-256: 0bb873d7ec52e85223d5d68e3df4e45b359e40255f27ee54ac601301e6aa5f7a

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