Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29bd1cdb9e37aa5…

MALICIOUS

PDF

73.7 KB Created: 2021-09-02 10:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d9d5f52a175a0fc3b1575c4cd43b7b77 SHA-1: b9a856f232ea17aa8909f40329b4be3240d883f5 SHA-256: f29bd1cdb9e37aa5fd212326d5dd28d7efe7cbf0e685d7c81fa6b040f5d8aaaa
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.findvoters.com/userfiles/file/52445804820.pdf In PDF document text
    • http://beiwendq.com/userfiles/file/tuluzutujimesaguvoti.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/wufobasagazari.pdfIn PDF document text
    • http://kingnature.ru/files/files/90408794315.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/317739eef701d6584740878911ecca46/semajig.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6565d9573---72144304922.pdfIn PDF document text
    • https://mashura.co/userfiles/files/40649745875.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/sefedikuzidezixeputakobi.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/61e9e5ae47d3b00cf44fe69bb3747fba/burajufasoni.pdfIn PDF document text
    • https://giasutainha24h.com/upload/files/90554740180.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/dawanemiremumimoredi.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/ferapag.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0hhjcc0dqg1e3rosb1e80t2nk2/90523276096.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1d7f92f8d---11701237437.pdfIn PDF document text
    • http://davcpundri.com/css/file/gizinerapufemataralo.pdfIn PDF document text
    • https://duel.pl/userfiles/file/99932835934.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e50c11aafca---28704561181.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/38022578869.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9abd17fcaf---wewelewigewadugeka.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16093b3206c3cc---75450987890.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/37503116189.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835df0a3976---16633057333.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/fd441c63d79aaec7ddc4cbbc1abc8a28/durototonotumaxelopi.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/faaab4363a84832d3fc175577e5a8fb7/68071776432.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/6560176246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=present+continuous+tense+reading+textPDF 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_off0000bee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE0 10704 bytes
SHA-256: df30f8ade3f3d9af43210b946120ab21bb7a80d0c70ce36911a8b9bb9ae967a5
font_01_sfnt_off0000d768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 15904 bytes
SHA-256: 6827ac93863786c430eda2a99aba9a28b8b0d759dce5e26ec3bdf65c1f244e9a

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