Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f04ff59adb1688…

MALICIOUS

PDF

94.6 KB Created: 2021-07-03 06:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5dd5284ab8e295e4f3b2fddd9b3b8d54 SHA-1: 3419b819b2865cc848410b81d62fdecb7a00ba45 SHA-256: 97f04ff59adb168844dcc84a72daa7990ba048366d26b3f468c9f8af8accb49a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wastran.ru/uplcv?utm_term=lofts+at+briar+forest
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/gqco0j3t21fah9jgcbkek6ohc7/lojugunazilu.pdf
    • http://fitviewer.biz/files/file/zoxusi.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/48c064c2d657a27e625ad0f7fc00cdc7/51602929259.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072896d0e453---43325509976.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607100b1c61e9---46360962826.pdf
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/nibuwosixuv.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/12c79408eae06bbc188fbaca57d6d92f/61367388540.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e802e3f50---45056850618.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/7a7f02ecc4aa68df79069f4e8ef199a0/58890909704.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db4183c17e---44447802257.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d2a1ff44---buseziror.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f1fb3fee123b10f28975f1a6974efa4/6132319487.pdf
    • http://alhouti.com/userfiles/file/50339366863.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/ef73f480c0649ca07fc779254c083e4a/74604138682.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d454dd2790---wogokubewanevodutamedi.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/fd44e8e0a1e33be347fc98f1d7fe608d/12123268240.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732f4fd3a8f---jimukutipapojuse.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/770006b622a7954e1351df135500d747/motaxugonudo.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/xesonobesudun.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/47da909f9916d80bc670bd919665bf85/tilopanifujomu.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1eac7bb69---34850183419.pdf
    • https://karinbentum.nl/uploads/file/mazerobikogiwodafome.pdf
    • http://cottoneauto.it/userfiles/files/1175838517.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_off00010f64.bin
37ae56b6ccac088e5b7b4e3c8a208f776b2a7ea9231c45e544528e80faacb53c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F64 17576 bytes
font_01_sfnt_off00013d5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5B 16792 bytes
font_02_sfnt_off00015572.bin
15b61135e18e97f4638db6dd2528e7db86f0bb661de2aed772d3680e6164334b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15572 10156 bytes

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