Malicious PDF — malware analysis report

Static analysis result for SHA-256 934a099c31053d6c…

MALICIOUS

PDF

82.3 KB Created: 2021-07-24 23:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d05c2e75a6894ece3ea5ddf563ea299e SHA-1: 537599c023efc596cc41e94b98fa6455c606520c SHA-256: 934a099c31053d6c963ba24aae7ce529f77f839a816ce5cc4a9a3461d6b7b624
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute malware or conduct phishing by luring users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://usmleworkout.com/files/file/dimonudiwidazemebijoni.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084c26dbb639---xaliwavimidalomamatorofo.pdf
    • https://akonis.ch/userfiles/files/gilukeparifowipubawemi.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc4bc2470---jiguzakekuwi.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860ff7eb326---28443951409.pdf
    • http://bean2beenefamilytree.com/clients/60578/File/mawupegonumuzanig.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/86tgjlslh5rmrmh8p4517nad30/65228503724.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca0b8e76b---zinalenedojoli.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f14b5a77da---43351707899.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608315edc26e4---38674987890.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guxupu.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5fea67ec5---ketipu.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f9c65f3a3---tizenu.pdf
    • http://crmrealty360degree.in/userfiles/file/24352166280.pdf
    • http://aaaexpressac.com/userfiles/file/purozijimijosabosoxulaken.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/99134695321.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/q22ir0almvembtsbrlkafhhn4b/mopatuvonam.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f15c7de703---xizijukepexedoma.pdf
    • http://aliglobshop.com/userfiles/file/41103889206.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f178e7c3e53---6453341754.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/vobuf.pdf
    • http://samtekelektrik.com/files/jekipisalimizi.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e3ef1ba41---21316292395.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/7a76fb98c715c595af7e4a82333a6f28/dutunujufataraxosixave.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/29ee36ddb96dede494f0ff31761ce075/juzedizobiwi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=el+aleph+borges+pdf+descargar
    • 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_off0000dda1.bin
68709f41c379aff054b6211f90b92721566eb82dcf971b042e3ddbec5abc09e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA1 17696 bytes
font_01_sfnt_off00010a3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3C 16792 bytes
font_02_sfnt_off00012253.bin
c507b1c49f6d92b96962c367eca8e7a90ba978e5ed4e202da2f105bc68c871cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12253 10728 bytes

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