Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22beda2d8c7233a…

MALICIOUS

PDF

104.9 KB Created: 2021-06-27 01:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 984ddfa2b887dc8de271f485aff67d1d SHA-1: 5b8acc2aebfdd16e711a83fea37f19695950bf04 SHA-256: e22beda2d8c7233aa407242a287a141f6f2be3d8f8498022f75fe4b34336190c
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://queure.ru/uplcv?utm_term=zeros+of+polynomial+functions
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddbd2e58bc---79232232670.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/5a475793e38c821e601b079efd05bcf4/6768974154.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/fc33e876861f1042e394a75a8548c2b6/90393702956.pdf
    • http://gocchame.vn/app/webroot/img/uploads/files/zimudivalilaxed.pdf
    • http://ascensionchina.com/userfiles/file/suvaxexovifedorapobesafet.pdf
    • https://x-software.cz/data/file/10027055272.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607517204c85f---95942290465.pdf
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071153c2cd9b---latetel.pdf
    • http://veribase.com/E/file/95297416701.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/b4181226b55cc5e872ea998066083019/pojiradegupiluzuwugebiru.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608da4b9e8c05---tosatux.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160983c0fb13bd---lokokarinuritepituwozo.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098896bae245---11144147176.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/0fcfda2dae90b0ebb1e9e6f72015cfff/tuvakugenozupigidabemotoj.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160725bf6e4fc6---vurutowinalaxigelozo.pdf
    • http://oticonshop.com/ckfinder/userfiles/files/sokilabegorudelojuvuj.pdf
    • http://bettynblue.com/upload/fck_img/20210513/file/98755881755.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afa2d97fe40---48857313315.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c133de488e5---riwawi.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/lkch397qngp7avv67fs1j71142/67182679353.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a085050d3a---25739623475.pdf
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/33503654410.pdf
    • https://tidurmalam.com/contents//files/70586496372.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/199f08d82876a3759d190ae6d6463dd6/66008441123.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/m8baa0gvr2deqbqgeq5g7std00/13687299740.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_off000131ef.bin
e49d9ebea998e9e5162fcfe8b314d8b5b00a9781585fd2903a789d5713d1bed8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131EF 10820 bytes
font_01_sfnt_off00014af0.bin
ef204a3cdf141d61b33b71c03d0e4796034417107abd3b10e192f43e8a104036		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF0 18724 bytes
font_02_sfnt_off00017c94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17C94 16792 bytes

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