Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5130d3b648218ab…

MALICIOUS

PDF

96.3 KB Created: 2021-08-12 08:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1da788014b77008c7e244b5cd3bd3ebe SHA-1: 224acf5ec9b82c7300e8ca81effaddf1727583da SHA-256: f5130d3b648218ab932d773f5ca23987b8520e4f0b1491366fdd91e4d3d35b9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to potentially compromised websites or link farms, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the attack pattern of luring users to external sites. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=libro+la+biologia+de+la+transformacion+pdf PDF link annotation
    • https://marathonroller.com/userfiles/files/kepowisemafenoporusini.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/wefepegifalabusapixixa.pdfIn PDF document text
    • http://reclamesticker.nl/images/uploads/file/pifufabowopanuleginiloneg.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/kesetateperopipod.pdfIn PDF document text
    • http://zzweien.com/d/files/sugexemitefit.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/0b6000436a0ad205a3514f317322b4c2/47293528112.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/babatitoni.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/75624573002.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28f1931819---zapolavuzazudanoxetukavef.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/gabake.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e18c7da2e8---60142419977.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/49033227225.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/jubukiromosibizibok.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/74cdda0b91ec292d343b0882e3934743/kudobegetabatitol.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/c14cc2e34d51992d1bed23d99e4375db/fojafabuzadedukukunizeka.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/58879631841.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/61779707843.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/lisuzixivat.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/60164094609.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/5e4f06d8cdb13ff11675dcf9795425fb/xurotegigaxumomufi.pdfIn PDF document text
    • http://17njl.com/userfiles/files/80308613327.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/30944995741.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160adc3b04bb05---xubowalodenigupowuj.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_off00010f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F73 11060 bytes
SHA-256: 48de55793c92d9ce9e6423bcc5346a0a9562ba56593ed1f75c18045dfafb005f
font_01_sfnt_off000128bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BF 19156 bytes
SHA-256: ffb1f5f0a8d15bd9f720ea92038fb3a23892d360defefcb20c690e69e833783b
font_02_sfnt_off000158f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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