Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d20bfbf3e1a2a0a…

MALICIOUS

PDF

82.3 KB Created: 2021-06-25 22:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fe6b9354c69b45f9d917d682b76f127 SHA-1: 127662e7a214eb878f6bc90cba4c152aaaf1a461 SHA-256: 8d20bfbf3e1a2a0ac384406621c0bd68b550c1dd5ae263af1b70c0ba83eae8c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://allytemp.ru/uplcv?utm_term=chinese+food+song+parody
    • http://www.annaleehuber.com/content_files/file/85878111707.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ccdd13360---95334617761.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/g0quqggighiv2elr3b7o8mibnu/46682115054.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e59f7e9e34---22427953238.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160be45742903c---93479241539.pdf
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/wizebawajolibipekafedo.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ba6a44cb9f9---lawasekimiwazepakogewu.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0ef470c4c---musebawibenipuwipovonis.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5060295be---pexokixepawog.pdf
    • http://dalnoboy.org/data/filestorage/upload/files/wuwadi.pdf
    • http://sarljarry.fr/userfiles/file/41165668934.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160853b5085500---winovaneverolasulaxedim.pdf
    • http://brkvinc.com/userfiles/file/22227335910.pdf
    • http://alphasigmaoverseas.com/userfiles/file/bolikizowelufuxexovo.pdf
    • https://arch.ua/ckfinder/userfiles/files/kegujamexu.pdf
    • https://waelfawzy.com/userfiles/file/
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/cec08a8ecee972e6bff180838725210d/21762661439.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/fa782vr10rh447smp34p6f5kue/79447433816.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c6264be80---99147647424.pdf
    • http://leaguengn.com/userfiles/file///23529670010.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9d77f46b535d29c615517ed4e0d52479/40940711920.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d1b5ac6b0---51006886840.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748c0fc28cb---17968841085.pdf
    • http://goteneplast.se/files/images/file/zaxupaguv.pdf
    • http://parfumerieindex.nl/images/uploads/jidawapimub.pdf
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56853562262.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_off0000dfd2.bin
2bfa5a13c0f20d89008f8831301a7f73dae754967040f6e106c038fc47b7b548
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 16944 bytes
font_01_sfnt_off00010b7c.bin
82bb78b60d510466634dd793eb38824c90d40307f4902ec7eafb241b18f46627
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7C 10780 bytes
font_02_sfnt_off0001240d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1240D 16792 bytes