Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9de9adfbb7dd225…

MALICIOUS

PDF

103.3 KB Created: 2021-06-26 03:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d9f016519a8907939304d5f9be5ff53 SHA-1: 12c600c6135e151206bd846fee0cb4b6592acf23 SHA-256: c9de9adfbb7dd22565abcfe3717bb66f07f2f7acf7d4e6e0e2efafe2f2cdb95f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites that host other PDF files. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5261d081d---zepenimapu.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824565b55fb---mozijufifogojawuseme.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/d5a16d4714defca618849794af542782/biluz.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607291f42ad62---fuluganigoburetonunemod.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/160755ba755abe3107107db0889897c6/49161658979.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608745ef3507b---42885928656.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/99976094965.pdf
    • http://kemenyseprosiklos.hu/upload/file/8913586271.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/5t1u3dl867q7jmk91q44d92sk1/5161170709.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbe7fc99f9---dikorobakumedozadu.pdf
    • http://chapelguild.com/images/usr/wixow.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098af148b1d9---rexavafumapekabi.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/9bc24350e8dd634b948e6f95c341acfb/jitexaboparixudegagusibo.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/f2e489f3b1a23a825e26e23aba3a98dd/77899017417.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160ba80268c41a---41139950829.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/cc4a79d9a0320cfa7336443a3ad1474a/pelapije.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/6dc7631f25122e222d0ef9957d78966c/13338667510.pdf
    • http://clearspace-design.com/CKEdit/upload/files/95777524346.pdf
    • http://salkim.com/userfiles/file/xijisanumemosopaselugun.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f547ed5e5b74f3f4ffd10c59d2f376b9/28576865572.pdf
    • https://weeb.nu/userfiles/file/22404204522.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/64343f8bb6af91a25aa96d98a1d57ba9/lobufevumibafowegixeloxi.pdf
    • http://angelcabrera.com/FCKfiles/file/fofabosilefubobizaveveti.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/4185129697.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=track+of+the+wolf+muzzleloading+supplies
    • 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_off00012df6.bin
c6c18a9138588a8afe38ed1ea8b71e91f61e1d2c4818f7a6ff4594c3a5cc53fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF6 11368 bytes
font_01_sfnt_off0001487a.bin
ae0f76b2548296e075ae9088d15074603a9e1d20e941c5780113feedb58e5e9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1487A 17980 bytes
font_02_sfnt_off000177a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x177A4 16792 bytes