Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d278ef64b6fd3de…

MALICIOUS

PDF

75.0 KB Created: 2021-07-24 18:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1916caab97b0d9548b39e5bbd41ed385 SHA-1: e81355f97b6c37610115a76d159e3b511f28c0ae SHA-256: 0d278ef64b6fd3de50379be155b1d52b2a8bc9a4be77dc877d9a80495369cbe1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external links, many of which point to compromised WordPress sites. This suggests the document is designed to lure users to malicious sites or download further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16087168876b7d---wenusoke.pdf
    • http://pileshoppen.dk/userfiles/file/76570266330.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/477f55f41dbd47538d8be09a7e6994f4/80023281992.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/7a023a926e3e038c4413548e18aa5c7b/vojefefasixirajokejizilur.pdf
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/kazopi.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608138d02b796---zuginipenewuzu.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d2b5e70eb45909991bdd3e8a4a3e4f58/44217859594.pdf
    • http://russia-ex.com/6482978382.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/c5b8f6534429e935fa6ed3825f596062/49592413506.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d26427d40a---toramuzebirope.pdf
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/13030206351.pdf
    • http://salt17.com/userfiles/files/27532499337.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/a58617a9e88e53a2a95a322f7954c54c/xalorijipudeposu.pdf
    • https://aprenda-atdi.com/uploads/files/ziwarakokafoduzozibajaba.pdf
    • https://aplusadvance.com/naver_editor/data/file/31264228587.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/26d3d6877bcd41a7ba909d0edcf855dc/14411940125.pdf
    • http://atreve.eu/ubezpiecz/obrazy/file/40993225493.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/fc1f161581d4973466a6c9328c02ed16/ganomisogexugu.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/e2ok0gam0o19baa51tdlgu3j1f/sibase.pdf
    • http://sns.hu/_user/file/rogoboxe.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b82e4ec0a00---wapizupaxaba.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b67acd3bf1538be4daf2838a37a58273/30825440088.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6990e26a5---miwimoniseju.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46a7c9c1f3---10088435790.pdf
    • https://isosklo.cz/uploads/kubowozi.pdf
    • http://brianhaymore.com/images/e/file/62636152247.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=kinds+of+compound+words+worksheets+grade+5
    • 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_off0000c425.bin
41cd175b3f3aa5a2945dc162908ff279b44ab1b687af5c7ac83966b27d19387b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC425 15156 bytes
font_01_sfnt_off0000eaff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 16792 bytes
font_02_sfnt_off00010316.bin
8a8d858c094039536725d36a700cc74c494d34c69b40322e7517c6ab96831a57
pdf-font-stream PDF embedded font (sfnt) at offset 0x10316 11424 bytes