Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a43980a7d473eb8…

MALICIOUS

PDF

90.2 KB Created: 2021-07-15 11:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46306505b08f93c246afacdef8054db6 SHA-1: 8cd71806ff68ad0b85cbd5bc4bfdd50c07c9928f SHA-256: 2a43980a7d473eb8a176977c16a46afc473a79513f494b73384e903db67d158b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crm333.com/documentos/file/zefexuzatabarotuxisugesu.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a6b3c9d8---14509925826.pdf
    • https://casabresciani.it/uploads/file/77454399404.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/2e5152dfe3895cfd1c65b46c2776150a/81217498548.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbcf38c27e---tibotekijes.pdf
    • http://gurukripapublicschool.com/userfiles/file/waxipefapel.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2590d57b2---85625794251.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/6e13nla31l99tv0bo1556jqmlo/45666609862.pdf
    • https://amblamy.ee/upload/file/81463002281.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc9b9e0b9d---41410814360.pdf
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64050197831.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e48677cd05---lerufureso.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8085e2a66---58301689519.pdf
    • http://kapsalonvogue.nl/files/file/bedavud.pdf
    • http://ecohouse-lab.com/userfiles/file/50312933783.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/370435a2272617c2386dc0b18243670c/36977632817.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4518c524b8---basujibosibovuleliwes.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a04c7acb5---73090257071.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609232ef8b628---ritono.pdf
    • http://thienlongadv.com/upload/files/tepesoluxiweju.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d0d365654d9254258f01db154dc35c65/lodepugelavelobejamegopuk.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34889df474---59795336046.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=give+a+hand+meaning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe77.bin
d1c267764a3789b3e3b628129f1558102073e0b79a1515c3401a7c80601d4e3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE77 17816 bytes
font_01_sfnt_off00012d61.bin
dbe24d02cecbabc2a55ff5d66b83abfb505ae3ce2194facea2e18feea8ce4412
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D61 10268 bytes
font_02_sfnt_off00014406.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14406 16792 bytes