Malicious PDF — malware analysis report

Static analysis result for SHA-256 4788a0d44928b735…

MALICIOUS

PDF

97.2 KB Created: 2021-06-26 22:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad4b69737685e30fa911706173450b05 SHA-1: 0ae6ecdac10012057f1f54f43f1a22de4a46a86c SHA-256: 4788a0d44928b735d8e76cdca2a6b280750bb5350381bf1d1e6c019d754a3d92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://chcial.ru/uplcv?utm_term=martin+luther+mccoy+across+the+universe
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f3f93390b---80252755587.pdf
    • http://qytbearing.com/upfile/file/35763851490.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/pvdfjkp0mrvqce9sm439mj33mf/68305475874.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/ec6d25f4db00ef42eb7fad54464959f3/89896410301.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a530fa170aa---70070622065.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/895c58191f6339b58b82790a113fcf55/54692827703.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba87cbc5419---gizenutunewexoj.pdf
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/dojam.pdf
    • https://communeouchamps.fr/userfiles/file/8020750781.pdf
    • http://anatolianlgs.com/userfiles/file/bepesobalepemupugidap.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/06253300448d58db77e04c8fde226e17/tudukezarusegarib.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/f40ca1a3507ac1af3cbdf169c7e1d7b2/75323010102.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/040d22a55b5edfe61f8e796f8d93c36b/juxugifo.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ijer4cudn7tsukh29s7bocg36i/xavetipaz.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/ee82beeeafeaead0430db691fe1485a1/17674708255.pdf
    • http://guowangcable.com/d/files/47106993028.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3c831bf1a---ridejumigabikerak.pdf
    • http://prtourusa.com/FileData/ckfinder/files/20210621_E89A65722CFD223A.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ef848du1f88tuk7igd3so2lj2h/vulogos.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a19366a4b---43214478989.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/75bb9ee83c2bfda3e3540a6b8e9675c7/98794276268.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f5e55dbae---dulowafutugewuzujalego.pdf
    • http://khanaphatgroup.com/UserFiles/file/54248835447.pdf
    • http://chretkinia.pl/userfiles/file/mipolesitulatek.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075589af3bea---19521357100.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 16792 bytes
font_01_sfnt_off0001051e.bin
894a2de4be8c06ddc128a1c44b61172e3e06fb8bb2d6a567ee2e08f3cd68e5e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 14908 bytes
font_02_sfnt_off000131fd.bin
69b237383a4d89a8c19d42b1d23965504f0cb91ffc738eb508a820fb9ff20850		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131FD 16800 bytes
font_03_sfnt_off00015dfa.bin
1440efd1341704f24a226dc137ce0a43d402e51f9d1e09c285c6a859ab652a65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15DFA 10768 bytes

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