Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2cfc3340e6d08c…

MALICIOUS

PDF

87.6 KB Created: 2021-09-13 16:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e544e934c876b1caad5cb5f181a4b24 SHA-1: c75eea264a1c6916e553e7edeeb14582b9a09b4c SHA-256: 8d2cfc3340e6d08ce008dcf98e7e34bc40072685e5a439dc3d68512d45c2c09d
204 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with several URLs pointing to compromised CMS uploads or disposable hosting, and it contains a visual download button lure. The presence of a 'password-protected archive handoff' heuristic suggests the document is designed to trick the user into downloading an encrypted payload, likely containing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://52fotki.ru/ckfinder/userfiles/files/27602709327.pdf In PDF document text
    • http://icbiz.ru/userfiles/file/fivutisapafilaruwakifimam.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/venaparitagilogukisag.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/60970048847.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/45875787279.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/bububakele.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/d50d049315a802444cc2279792592672/lemovil.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/77109107734.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2b6008ba5---83789554277.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/desejen.pdfIn PDF document text
    • http://olympusflights.com/files/files/40962072738.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/totasa.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613211c5d1783---5181037032.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/80588274174.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/60124858071.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/vigedusitibidut.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/94178107620.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/nemijaroxuguvubisedazoje.pdfIn PDF document text
    • http://medi-sen.com/files/files/68816476073.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/dozazozujazilefodivalozas.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/28573397956.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/60702785056.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/23562377381.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/87347934685.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/joburozevelelelivax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=booyah+apk+for+pcPDF 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_off0000eb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10312 20376 bytes
SHA-256: 77413ae9315a0fc32642aca8eb19ba908fca8f5bf9a05cec0181b697917e519e
font_02_sfnt_off00013935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13935 10196 bytes
SHA-256: 20a2164cdc835ec704baaeba254324b6afcb79826e339d5f33eeaebbea00129e

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