Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b6bfe7736d4d9c…

MALICIOUS

PDF

84.2 KB Created: 2021-06-29 07:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d24ae76e61280a0ea8f228708161359 SHA-1: 634850fdd6b3a66f7260a54f50b85e58c8a64a40 SHA-256: 95b6bfe7736d4d9ca74ff00f85246cbeea3ca7b39cbe7edec8b5f1de372db774
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites. These links form a link farm, a common technique for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=specific+gravity+to+ppg
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/9d2012b0142d4464f375e6d14f9f6a1a/57187791409.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3dkhaj2g78bu38s9n5b9m4dg86/59332587775.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca4583c8b2---ledovirizomazexepeje.pdf
    • http://ptaki.info/imgekoprojekty/files/gefotikifewovuzepuj.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160960d001b233---90497527902.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/b8f7610351d0b72f3c7ec3ab02cf96ce/nijunokiki.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/620e38545455d0f34ac014d04071232e/18252738909.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/11d2dfcd0c312ec339091cfc2c5b7791/20281973944.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0384615eb---seveloletebiredoramadi.pdf
    • https://tepihtrava.rs//files/danekenaj.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608479552b16e---81516410467.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f8aba2940---regibi.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a94b0067fd---61235103950.pdf
    • http://peach2560.xyz/js/ckfinder/userfiles/files/67557159439.pdf
    • http://ibshop.gr/uploads/_uploads/files/43414242352.pdf
    • https://dondepodemosir.com/userfiles/file/89311172586.pdf
    • http://jfhcoaching.nl/userfiles/files/11447714832.pdf
    • http://houselandia.ru/files/16011697205.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kbprrpc12rt325jnt2cato6r66/nolirupipunufiwuxijejo.pdf
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/niwugabageje.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/6bf6f327fa7eeb611b4c661a3c072343/12190957531.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d39fb8c2ff---nadodevun.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608e59bc272e2---wedeluwuf.pdf
    • 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_off0000e4a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A7 16792 bytes
font_01_sfnt_off0000fcb9.bin
56f82ffaaebb0ece6d9e2d524a13e9bcbd49cf005ab447161f7b99079f3db37a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 17528 bytes
font_02_sfnt_off00012b13.bin
3c6df75a18a0641845a0977b30b8ba50ab929715a98c85b088386a98c27a938e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B13 10592 bytes