Malicious PDF — malware analysis report

Static analysis result for SHA-256 9214fd1aff452104…

MALICIOUS

PDF

82.5 KB Created: 2021-09-23 21:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 509452ac9356d7843ac2f4731fa84ae4 SHA-1: a23d08e81852c33e2915dbee78ea962b273d3ea9 SHA-256: 9214fd1aff452104ff0f409b537561f4b714594572f3cae35c3340bd2fda7ab2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through these links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=android+emulator+app+store PDF link annotation
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138e32c5f090---xunepiwimegonojilusej.pdfIn PDF document text
    • http://tenis-klubmoj.si/uporabnik/file/37574718750.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/71513359720.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/jixatowegidi.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141c5726c5b2---renuvodotisuxoriro.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210905002043.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/79901844992.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/zogadejakesaf.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/kikejamawitonisenererog.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puxagobifetanafamikozokur.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/cf4154100a9e6f4a424a3323e698da25/suzuxifubamujojulo.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b6e0e6823---63674190572.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/jageraxosiwo.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/99174263208.pdfIn PDF document text
    • http://ecole.ru/text/images/file/40280782003.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/diwijekupenupafi.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/jadibo.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/17931432729.pdfIn PDF document text
    • https://nexapos.com/upload/files/rovabimizixefolenopu.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/3c7dfba8e537f06367da8fd6bd5e638c/43964261358.pdfIn PDF document text
    • http://polipack.ru/content/file/melaxazodur.pdfIn PDF document text
    • https://harmony.im/userfiles/file/9288674604.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/tuvamozopukakeganem.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_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72D 17280 bytes
SHA-256: 8f01caa7b08879895a9861e66e7656e100051df0350484145a47281784606bad
font_02_sfnt_off00012404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12404 10636 bytes
SHA-256: c988f418ec632d87eac2e8cf49baeafaa7b7b7a1fa8eae26da4310b26a11d6d7

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