Malicious PDF — malware analysis report

Static analysis result for SHA-256 da27ca22d254908c…

MALICIOUS

PDF

76.9 KB Created: 2021-06-04 07:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 065a5a41377850e0d26d36f77d96b56c SHA-1: bc2bec71c248c90c43db2d21ebdb0ebfa3411569 SHA-256: da27ca22d254908c9784392fd571a6cc8242bac6e7d926d3dd4e370f02c3205c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/uplcv?utm_term=texte+justifi%25C3%25A9+adobe+xd
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7185d0281---puraw.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0500d8df26---zunolovaxorezejime.pdf
    • http://www.look4job.gr/images/_user_na/file/mosujud.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe1e3d9f45---beworoja.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/f513ff152d7a341cb6c284f2a55eb872/17603373823.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b152c0cd6---18758071196.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a65d507e5---8527933555.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a81e5f9a13e---11671771365.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/lhkg1g6lg2t0d0nma3je558j0v/nebulutavezuzexo.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/9d9438ab062a6e2eb9f198dcbba86b83/57468496229.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2846e427b---9283633672.pdf
    • http://nsdadventist.org/FCKData/file/44001585652.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c127e5ba87---dibivoginiraxox.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a89a2690988---78857398752.pdf
    • http://thunderstar.cn/userfiles/file/20210503130902640243878.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a55f3eb7ee89ff08df5183bce6bcf8ed/detejazeso.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f132cc37d5---3495241766.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • 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_off0000d863.bin
f6e23a371e98da5f0511ba1ac2624c92d84cd36a696948edfbafe8741cf1ba7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD863 5148 bytes
font_01_sfnt_off0000e9be.bin
9d733cbb1a470ba4ace856fee399d6daacbd01c6650cf5772fbae01e25a97157
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 11408 bytes
font_02_sfnt_off00010f3a.bin
404e1226548f0199c2cbf4b3f5519c2d1de265a862b751d42a4baadb1dce8b19
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3A 16152 bytes