Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da62fe3bc30bf2e…

MALICIOUS

PDF

85.1 KB Created: 2021-09-02 19:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 485ce24c5c2e3902b230ed5a16a33efb SHA-1: 2cd765b61fc8e343215b994c0e57b76c1c95eb61 SHA-256: 1da62fe3bc30bf2ea0c08da673f446696ab2a5bc89792d53e9e5beb96477ea20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for phishing or malware distribution. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=cfc+evangelization+training+manual
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/27vul6747eh0adtds6gfij9j34/bimilibop.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c71ac6e15---vurogik.pdf
    • https://marosme.ro/hirek/file/27611150051.pdf
    • http://jljemc.com/upload/files/48922486737.pdf
    • http://yizhu580.com/ckfinder/userfiles/files/60062744591.pdf
    • http://efrex.cz/files/file/ketijajasemuwokezemuxepa.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070fa8600ee4---5545918675.pdf
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/94359203608.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607810b2cadc7---vigifevobadewem.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba25760baf9---25166686480.pdf
    • https://accuratesearch.com/userfiles/file/suwalilaxidosutofomuwab.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160837c88c88c5---waburusatidol.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160924e2435e70---99880001779.pdf
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/vuruluvokif.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/225cb0ba083d2f47b98499fc0bf82994/farupemex.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccf1eb02e9---mejibedulipaminademewodom.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/j22pianvnraff2ue9556h3t66u/rilenufupufesogonimikaj.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7dk5dctapofovrs76fm0fv814m/31291011022.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/o47j5vg2j4vjg5mmtbrs6gqpl7/11770495600.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/xikibudegukunik.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab46e38c75d---fufulut.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c85127dfaee---90621246071.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/351402cf25741987c9380422ff4553a5/dozunemupijokepenedigega.pdf
    • http://volamtuyetthe.com/userfiles/file/waxekopesuvifi.pdf
    • http://nhuaduongnhapkhauaz.com/upload/files/jonatupediligir.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_off0000e64f.bin
ab993f9b111f0aca4bc547f6ca91357dee1b67038c45a15500ef6f595f47ac19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE64F 10768 bytes
font_01_sfnt_off0000ff2c.bin
29f353e94d743aaaf58c6974199dc8f8d65cd24f3d9f4721f164ae155e6b3633		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 18304 bytes
font_02_sfnt_off00012e68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E68 16792 bytes

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