Malicious PDF — malware analysis report

Static analysis result for SHA-256 b324a3e198ba1497…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 22:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 255dd7a211280b3264b3a2121d6565df SHA-1: 37e60fe7ae7d727c6ff26853c03e720886b98b7e SHA-256: b324a3e198ba149736f3bf09af569634bda469d1aeb0344dcc3fe544ffb08673
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm that redirects to multiple compromised WordPress sites, which in turn host other PDF files. This behavior is indicative of a phishing or malware distribution campaign, likely using spearphishing attachments as the initial vector. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://huntic.ru/uplcv?utm_term=adrian+paenza+libros+pdf PDF link annotation
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ece404d0e42---mizilaxowufobowupime.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/keviboxomuposagozatobas.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/borobuwuladadagoniro.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876e6b36856---zazunum.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45828374832.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tt7gvfo4h2ukcst9dbr70n0t0v/50704066593.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/juwebelejividamuxamiluna.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/65533953208.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/xagofizizow.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d8facd3b1dac42ab3a8cedf7e7762d5b/64490447536.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0fd4cc685b698d29cf4b4d3080f6bc98/62355304876.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab5279ea0---zasawobebivevewopet.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/xakejuw.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/43758497534.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/modepo.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/bonagubumepudu.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/76545928927.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ef2gmu0bo188f04e0kais724l2/varax.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074088a9b2ae---bumavota.pdfIn PDF document text
    • http://tulga.ru/editor/files/kifenatipu.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610b1a099331b---piwebusidefazepibar.pdfIn PDF document text
    • http://parilka.by/var/upload/file/41803764010.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/gukudamefesixezibedi.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/xugebitawatu.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_off0000d15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15C 19672 bytes
SHA-256: a04835a9aa15d06424c9369ac849b7e53489f1a18c740a1b606ddba81be270eb
font_01_sfnt_off00010452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 10576 bytes
SHA-256: fc442fd0e136693ff834d7c54427e1c670f4c4de9286673f72c113c70724311b
font_02_sfnt_off00011c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1