Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a28dac50795b58…

MALICIOUS

PDF

87.0 KB Created: 2021-09-04 11:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 44f26f3f123a83a82efdaaa8bcac07e0 SHA-1: 793b6d9049b6c47534fec99e9686b83d293ad6a2 SHA-256: 68a28dac50795b5830c5cfd389d618ca8e4a38b5ee11d0957502c1a94bc60248
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites for credential theft or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=enduring+issues+essay+outline+pdf PDF link annotation
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d665f44317c---61619247983.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/28597893223.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/bogunaku.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609468d49ff9f---90623947138.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/48579424497.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/qgp1jhio2qb9q5iodk30d26c55/57880376837.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/93863478756.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/22927946782.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/sukam.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/25365638099.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/8806728516.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/b03dcf76104ed80634248eda03dcdf93/50094829528.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/57751230172.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/1urru1aipfupl7329tr7r5tqoe/jijalelifevivowenoleriked.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/lejapigikajuselumikabupuf.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/94194693716.pdfIn PDF document text
    • https://go2germany.ru/files/file/sunezofimulogaz.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/2c4a4fcf1e4fe57e2d70e4bf755d1c51/28335831644.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55e30dff30---nidigakebewed.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/kokikanubenesukavijorabiz.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///xofebegemisoderoveli.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2kd4tnk69sdeljgmhl8eccrdu4/99594090785.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/jajigemovipapedosu.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/loburarex.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 18044 bytes
SHA-256: 145ef4cb1ff9098f57aa21eb69af88d5695198875b74deb3bbfcff9aed825b38
font_01_sfnt_off00011cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBF 10872 bytes
SHA-256: 9ef8b1528d3fc47c423981e50c4f01364bbbc1c0b11d0f843e78852d1a2d576e
font_02_sfnt_off000135c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1