Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df74ef2a5eaca25…

MALICIOUS

PDF

103.5 KB Created: 2021-07-05 16:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9fc9eb92fd989bac044290dd272797aa SHA-1: 7054e365650c4d8d46e6ec0d1e01b39f4f10171d SHA-256: 3df74ef2a5eaca2551b4d053045d1043abaa72f3a7780e0a10e1fdd4bcf0e9d9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories and disposable hosting sites, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://beateromer.com/bilder/file/xuzosetumigofaxa.pdf In PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949eedd6eb8---78226873632.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/2cdsjhjfmk1308vgqfmops1o2d/biwisuwevuvif.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/19160218255.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/dbd4ed9f55f01b9740d5bf7e88ef9c67/73332029158.pdfIn PDF document text
    • http://airsoft1.ro/files/file/77548380682.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160712d95a75cf---5531100272.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/88440154323.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0c5362cea---wivaxutulor.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab02438c3d0---36882873717.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/gizofu.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/a662955a3aa0cb36d79362b0830b59cb/68928219843.pdfIn PDF document text
    • https://combrooncom.com/contents//files/ruvozakiwovunagimuleta.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/85458117991.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072be76a1ed4---38277848006.pdfIn PDF document text
    • https://spacio.hk/attachment/file/xawuvufuxebazewitapagupox.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/62ae1c02d65b2cff2814bbfdf457367b/nusagorakonagemejaku.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5cb3a645a---luloguwagovavozeles.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/20926856018.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d753433872---45589700982.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/najek.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/o0p99q1u90ituoomq8580fvr4u/665100892.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/7av0rv5q4sutr4gkfjontariit/kaletopuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=another+word+for+showPDF 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_off0001302a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302A 10216 bytes
SHA-256: 889185565853b34ca97176f44aed373e2454cb8c6570dd75afbb7a1758f8c1e9
font_01_sfnt_off0001471f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471F 18384 bytes
SHA-256: b1ec7d31d39ba1ab8d877b384d1f4ad28d6a2844b801edb758e053ad643fc0df
font_02_sfnt_off00017760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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