Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc910b60bf1e59cc…

MALICIOUS

PDF

88.9 KB Created: 2021-08-09 08:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cccfc44be985e6b7f9836dd7b30c9901 SHA-1: b1ad4d495b26aea223ddc6c2cc8526bb5da33ff1 SHA-256: cc910b60bf1e59cc6716d2b8e50a08974773ccef1cde16300a39419b24a33a39
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various external PDF files hosted on potentially compromised websites. The presence of embedded JavaScript and numerous external links strongly suggests an intent to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887d080f0c4---73574439827.pdf
    • http://dainichiji.com/upload_ckr/files/jomado.pdf
    • https://brickbodysupplements.com/newerac2c/userfiles/file/9874446470.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be46943fb2a---xopusugazaguve.pdf
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37242135257.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ftfd8ang9t2f1ak7aq9hmknlj1/88643096694.pdf
    • http://richwoods1969.com/clients/861079/File/lizuj.pdf
    • http://interwork.sk/userfiles/file/5948727165.pdf
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/jusegaxevipugoruteriv.pdf
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/20666721349.pdf
    • https://cezartravel.hu/userfiles/file/simofesojerinigov.pdf
    • http://phuvuongcorp.com/luutru/files/50897376018.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e59a5cf0de79e1bee808c0a9e1c313c5/sulubijefowivu.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ffa145bed---70659683530.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/bfa7d9d39c0ef3a7980edd4fd89f4555/favulodes.pdf
    • http://kfbi.ru/content/file/zafomejuwe.pdf
    • https://pendekaremas.com/contents//files/96669065308.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/e1f157d6330b5535e414a8c4da8383f7/nebedalitixirimoz.pdf
    • http://xn--szabowski-tub.pl/userfiles/file/18673191233.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6953952876---30684887048.pdf
    • http://ledseoul.com/userData/board/file/zetutevifefabolorinazerud.pdf
    • https://delaneyllc.com/ckfinder/userfiles/files/nezarulewizuz.pdf
    • http://kashima.cc/userfiles/file/31135383064.pdf
    • http://gianniarnaudo.com/userfiles/files/vilibifonujopatijig.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=broan+bathroom+exhaust+fan+installation+instructions
    • 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_off0000f4b5.bin
b2b16a0732cd624c92a64155d89388ece9ae2996e3746c4a5d805baebfbe067d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 10996 bytes
font_01_sfnt_off00010e20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E20 16792 bytes
font_02_sfnt_off00012632.bin
9e2d1c67180d87332c73128562ff899dd5da29052e67bd7ec64d150c99ae8491
pdf-font-stream PDF embedded font (sfnt) at offset 0x12632 17320 bytes