Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ffd5e1fb0d7244…

MALICIOUS

PDF

68.4 KB Created: 2021-10-03 03:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1cf01ca8202d0b6a21480db6a3d6ce00 SHA-1: 0af14e6af018492c224694d1d37505ce21a57ed1 SHA-256: a9ffd5e1fb0d7244e9c686398cd344c95f220394546848b02dee47d816711d5e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document is identified as a phishing lure, likely designed to trick users into clicking embedded links. The document body is heavily obfuscated, but heuristics indicate it contains a large number of external links, many pointing to compromised CMS uploads or disposable hosting. The presence of a click-outward action and the document's small size further support its use as a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pistant.ru/uplcv?utm_term=dialogue+in+the+market PDF link annotation
    • https://auto826.com/uploads/files/67677786666.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/xofupatatemexafuridef.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/969a679852a82237e98fcae7509d863d/65608184327.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091109235373499.pdfIn PDF document text
    • http://tid.vn/upload/files/61712199643.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-6/20210906135735229408.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/80059935560.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/nufuxexupuniruril.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/vekuviripevibagevotaka.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nozilapotawi.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/88872337354.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/gesopenigig.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/guzejoponade.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f67a1f26d4---zimilorosegupi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161455af5ce956---77942441302.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/37634438198.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161445aec24add---4115192800.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/64091155349.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/varamapudodivuw.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/51210836834.pdfIn PDF document text
    • http://asvpp.fr/pdf/wexiz.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/lamozidusutagexo.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/76380512072.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143eb3920794---ginuj.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/girigorikeleludupaxuja.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_off0000b17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC995 10580 bytes
SHA-256: 98aa587ebb911927c5d005262984a7e4367402bb93825ef106e9e40fa71db629
font_02_sfnt_off0000e183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE183 14088 bytes
SHA-256: a40500ec6eb3c1e2126d7f436da09cb361ac513c15faf29b82b0e60da331681e

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