Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a5cb06f3d08944…

MALICIOUS

PDF

75.2 KB Created: 2021-09-02 15:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d7ad69aaeb6f6b1b4bd78d8b5721f2ce SHA-1: 86ad09b0613201e64011812218bbbcec24be6fc7 SHA-256: a6a5cb06f3d08944a398b242c52f8868d20cb09fd0d4ef8e73bd789b4cf85c3d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The embedded URLs and link farm structure are indicative of a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aldobini.it/userfiles/files/62390668288.pdf In PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/39959918622.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/zevibofiputapo.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d53f67cadca---wizer.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160833878dfbab---lodewivemedolaxakikuw.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/fotavagimajogolivaxitu.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/18622214923.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3aaa79631e---bajujonakazutu.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/fuxobimak.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cb92961c2---doxezek.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f6e3c521b3c---xufowom.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/lupeneditura.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/savalavizijetibegabuxija.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/fijasibeverikiluni.pdfIn PDF document text
    • https://777mto.org/contents//files/pekogexinuverivevutitig.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0cd2611cf---zimojevujinunabikarofuju.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cf9dd9deae---futafekatevobotupojiki.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/puragojeweger.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/semotabonologe.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745b6f6b2a2---puberuril.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121b615dd3ba---detopukigetafaserep.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089a685d1fa7---jubavasese.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/4f30e0aa520195f7fe353bf496bc87f0/tisodurowuwebedabexadelef.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/69705629511.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/eil5ifoes7et1pvopg567ubkg7/27735809406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=haryana+gk+book+in+english+pdf+free+downloadPDF 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_off0000bd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD82 11104 bytes
SHA-256: 4925db76b050abb458b282f49feba8b91d9bf9e11012469650a566bb35a3f723
font_01_sfnt_off0000d6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E3 18644 bytes
SHA-256: bb72cfd588784850622c656ae7246d1ca1bb5c63bdc684d2f309cf041ce6413c
font_02_sfnt_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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