Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b4d9899a916682…

MALICIOUS

PDF

91.9 KB Created: 2021-07-05 20:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6cc8246568a98333dbc4d4a374e8f5f SHA-1: 0de6e75ba5ff0d242a081821bd15b829a506f69c SHA-256: 74b4d9899a91668239d63a6df6df66d40d8d4064a252ae56486328a79c7661cd
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 ClamAV as malicious, specifically as a phishing or trojan. It functions as a link farm, directing users to numerous URLs, many of which are hosted on compromised CMS upload storage or disposable hosting. The primary attack pattern involves luring users to these external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://akinmedikal.com/uploads/file/75319570406.pdf
    • https://fotoprint.lv/downloads/file/ramagelawezixa.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fbfc3a2c1---28195626888.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a97b76e5848---40310175684.pdf
    • http://sieuthibongda.net/ckfinder/userfiles/files/27798414020.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d737bce922---pimesumeturudupanabomo.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/mnj58kfdult6jf12cq37fslfd5/47604156238.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/1bb3492174579c938bd457a0ba492860/diribajiniwotitisidawetu.pdf
    • http://spreewaldatelier.de/img/editor/file/3396245684.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/837b5f4cf09896205fbdc6b2f6299ed4/sovavawepoxudu.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/0e66c82c69ed92b46203b3ea22e801a7/76356657054.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f6ecc861e657341a5f4a67bfe946b6d3/30990987053.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a1bd4c10b---23803539223.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec23759ea6---pujopunuvapewizunut.pdf
    • https://dejavuruse.com/userfiles/file/27485016947.pdf
    • http://marathon-gexin.com/Uploadfiles/files/28858015343.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/eed44db43cd923788413507e62fd2aca/32841515777.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945068e947b---77706704739.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c365b26d77bf97f88170a4d50469e24d/43765085451.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/6f8e03ab8a180897f5d1c6e7663e61ee/1799921902.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6d974de5c8f42de580fbde50dbd23c2a/6116956664.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a173d712a1b.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/f6p4hk7qtojuhrfrvk8jb0ark0/gojabelogemapaz.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/4c3b3969d9f466446328383726416549/renagujekagaginemiwuxugar.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=aphorisms+in+civil+disobedience
    • 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_off00010214.bin
75cd005ec6d88eaac71bc71f74078eb99b88c9362c42d19aa476dc73ebbecd45
pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 10704 bytes
font_01_sfnt_off00011a36.bin
6f55e80dbb3c3a01621324d52f81f23baa30870bb7819774f1614d1deae228d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A36 17872 bytes
font_02_sfnt_off00014899.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14899 16792 bytes