Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb29b62e4a6aebc…

MALICIOUS

PDF

75.8 KB Created: 2021-09-17 11:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7f4821228ec39e57041651a5b92d6c42 SHA-1: da32400aa74ac90051e8ba88935726e89fda6fa5 SHA-256: bfb29b62e4a6aebca6b2bcf4721743da912f1e28c05590d3f724418c9871aa94
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains numerous external URIs and links to compromised CMS uploads, suggesting it's designed to lead users to malicious sites. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=samsung+s10+live+wallpaper+apk PDF link annotation
    • http://seattleteriyaki3.com/uploads/files/52570984036.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/ziramewupifubigu.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/84140311083.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/gapemonupe.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/43295278296.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/misuba.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/tirumaki.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/68681396095.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613a307d6156f---texab.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ea74f653aec8ab9b116fd5a32e7497d9/xavibukalorive.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/92b689a1cf7aaf8c7402097456f8abf7/bomutokafobodijile.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16136f9e43fb32---68506270615.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/82902251862.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/74191844172.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/62136794037.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/84529365997.pdfIn PDF document text
    • http://rentaruedas.com/files/others/151746598.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140b933366d7---3731315265.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/luteg.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/givuzodazopewikimuxejejaj.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/65127161843.pdfIn PDF document text
    • https://sinarwaja.com/account/files/sajizujadegepigarefotur.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_off0000c298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC298 17804 bytes
SHA-256: 4b99a58212842ff3fe72b17e67c34b0e2e03f4bc359f5471131b72ce2c28cf80
font_01_sfnt_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 10968 bytes
SHA-256: ac510e383dd27b3de874fe98c4626045b2c01bdd25c40a0bd5b2b299d63df7ba

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