Malicious PDF — malware analysis report

Static analysis result for SHA-256 375223ae30dafa9c…

MALICIOUS

PDF

72.9 KB Created: 2021-09-05 13:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e312cf1957c1a21983599ccac79365f9 SHA-1: ccb37556e3fed6acd967583e8a623434d9d932f9 SHA-256: 375223ae30dafa9ccc8c9f1ad49e57b97391a0bc15f825b4f989e1b5ba177b45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate a likely phishing or malware distribution attempt, potentially leveraging embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=nominal+pipe+size+table+pdf PDF link annotation
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/35b640d8da7ed5ee7d301787cce318c3/59870827033.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a02c8d6d0d---71293529105.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/31897327099.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/03f35cdc61451ded031803bebbecca89/momosatafewifakimuvi.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/0951debe89ca453389f26d4e4cb9de72/50684042766.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/lawukesupilidifisufuzid.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/8729552158.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/8097047e0e2144a9472470e0708db666/guxafezujunomu.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/931a5e6b3aaabc7c209141e656e9b618/tijos.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/89pfgr4fuo6vqs2j4gvepopdt7/toruvifa.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/ridifaxozegevafidijo.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16117ed0c07852---telodu.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d2ce55c0b1071c92a4a6ef77d561cb93/mozubepirejupetobitejewu.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/96681528024.pdfIn PDF document text
    • https://italvaping.com/file/46705776959.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/xuxijusazed.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/81457415430.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087bdc37e69b---59737792945.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/91325161377.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/61782d2e9a71edfd1abc8032be753551/44563236629.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/pogoxi.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/vasomapo.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1503e8c43d---61127362370.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_off0000bce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE2 15844 bytes
SHA-256: 86fa70fd1b4e31decc96d87a6a5e67b87d1aadc5c139f39554116ec14823df39
font_01_sfnt_off0000e5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B2 10736 bytes
SHA-256: e0112583cffd96c7286964e683d225573530cb9320ddd994af91e286f8d4d058
font_02_sfnt_off0000fe23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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