Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5366b897b90951…

MALICIOUS

PDF

119.7 KB Created: 2021-07-05 08:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32c073049dae338ce59eb3a5b2bce319 SHA-1: f4b17f127fe702894fb73cb11a4e9ea7d44fa550 SHA-256: 4b5366b897b90951d88cf280d10177f0371493ce560d904cf9055a04170914cc
156 Risk Score

Malware Insights

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

This PDF file contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. The heuristic firings indicate it functions as a link farm, likely intended to redirect users to malicious content or phishing pages. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://queure.ru/uplcv?utm_term=world+neglected+diseases+day
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/fc31c057b98deee36c18d6b91c929ea2/4592588088.pdf
    • http://kaies.cn/upfiles/21052306421454945588evxc.pdf
    • https://mk-promotions.com/ckfinder/userfiles/files/lijomom.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608785e396e0f---wusubomefotitisanu.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/39a8122798ce72de053d932e525cd49d/80122891933.pdf
    • http://chapelguild.com/images/usr/refibox.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/d8311a6dff272d959b1034d5fd9ffa7b/45970098036.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608073633b181---bizonosonabulesaz.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16086976690f96---84806998398.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea6c8d5758---fepuxopokevujururor.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/2tgr6lmlmfa5s8bsv9vdln1ou0/pafufagipefarexusixawelu.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780745a4527---dadilenifatexobokudowezo.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ae95199000121b287b9ec6af573b33ef/lakijex.pdf
    • https://vegan-eshop.cz/data/file/niweti.pdf
    • https://fertilizergranulatorprice.com/d/files/zodepi.pdf
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/90433468058.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/47e90f2a00637f5c5cb62d495c2606e0/donexedawutagazonufawe.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/792b521933e20382ba9e3402b846a8af/runolelokilanokodijolo.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609868c7709d7---wulumafavodaguxugeduvuna.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160952f2413caa---9325395713.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/cf932d0e6ab1bd5a0c7d252da862ac0a/62427788540.pdf
    • http://www.odnpoznan.pl/fotki/file/file/81097638047.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/5c528117078244ed3f8a9f1c347d9ffa/bigafatafuw.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721c493a240---vudab.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_off0001718a.bin
7789a8850c0fbe2d90d31da6f2d89b962b2f297d4a00f21b94730a5b78095e71
pdf-font-stream PDF embedded font (sfnt) at offset 0x1718A 17660 bytes
font_01_sfnt_off00019f3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19F3C 16792 bytes
font_02_sfnt_off0001b753.bin
028d7043fe8478c2710c4a4c29e624d71edc2d165e5b50aba3289b92c596a65c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B753 10652 bytes