Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9758181b4193a4…

MALICIOUS

PDF

90.4 KB Created: 2021-09-01 11:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 867db62b9ce7efd56e260efe80fe8ea0 SHA-1: 23723936a09da4d2963e642396406b784a0f979d SHA-256: ff9758181b4193a4e51ac6c42feaa91e6fbb03fadb09284acff40051ed6a3542
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm used for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0f4496f68---verexumow.pdf
    • https://tskrea.com/userfiles/file/jaxosu.pdf
    • http://shiokuda1.com/contents/files/felagizurunusirimug.pdf
    • http://www.recko.ru/ckfinder/userfiles/files/golosukefafulikik.pdf
    • https://pmsp-me.com/userfiles/files/gugebotugeg.pdf
    • https://grandhotelbulgaria.com/userfiles/file/28625868783.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/94b9ac177f04a05067c57a71bce78241/wupelige.pdf
    • http://allnatureint.com/userfiles/file/rujajarubijufij.pdf
    • http://mayinluatudong.com/uploads/userfiles/file/setezumuse.pdf
    • http://envigest.cz/upload/file/mabawajanegaserifukudizem.pdf
    • https://alteanetworks.fr/img/file/rijowapebabev.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe481d62a1---31276910947.pdf
    • http://controldellaves.com/app/webroot/arxius/file/dofarupufifobixofobo.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/ad54ee24a34d1f4bf06326d8308b983f/vodagame.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b01fa6b2a4e0650286a2ea926bde0d6c/16740469556.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da6810c91d0---55155681138.pdf
    • http://www.srijonihealinghome.com/fckimages/file/wagifozu.pdf
    • http://bosch-service-center.ru/uploads/files/runoz.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/is2rlbanlq8lhn1mp15fh2g4s0/tuvom.pdf
    • http://augsburger-dartliga.de/uploads/file/sekenivupubovakilisolopaj.pdf
    • https://htchninc.com/d/files/mijomotefem.pdf
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/kinava.pdf
    • http://nhs-carpediem.com/clients/46367/File/gijijerizipadajiji.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=bad+miss+america+answers
    • 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_off0000fc53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC53 16792 bytes
font_01_sfnt_off0001146a.bin
b0578f84dc7f581e04b0e7c6e5b4f0d17278fdb3dab92de1075cb8e66c348846
pdf-font-stream PDF embedded font (sfnt) at offset 0x1146A 10404 bytes
font_02_sfnt_off00012bf7.bin
c0d339da473919d62255479551930a9c19c6085f5a9a10b51eec13a1219ff19c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF7 18232 bytes