Malicious PDF — malware analysis report

Static analysis result for SHA-256 a910bbe22ff6eb3e…

MALICIOUS

PDF

85.5 KB Created: 2021-06-29 02:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a6ea0cc60901b6a660b63c26c126ec2 SHA-1: f062c6e5c64a42f563936c744045d964071940d6 SHA-256: a910bbe22ff6eb3ed39f3c4b4c0e3739376f03f18170d8811edfae42a54fd338
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These links likely serve to distribute further malware or lead users to phishing pages. The PDF itself does not contain readable content, but its structure and embedded links strongly suggest a malicious intent to redirect users to compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/6nvp5c55vu4efup5gvard8kpo1/faparozitujiwotadugif.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075383e93e17---puzinuwixojela.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/28809278668.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f689005bf3---bulotepabalopamuvozusodo.pdf
    • http://border-inn.com/CKEdit/upload/files/24059013464.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/6acf30ef0505d1747ea98c67daa9365c/jekibenijazopi.pdf
    • http://yuha.be/_files/file/jefolamovugevokokimub.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/b5e7691c0a9237ec3e8ec08187817a6b/62549076333.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/334011bfafbe13fedffb8b6e7e114fce/53107610729.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/b4rpvr1ibc105tc6b8cqllc6fv/31154439629.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/7j1u359do9ar70frvg406tkd8f/xorelokizesesag.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/6cc69cce2f5a111a8fdb64b98db5bfda/mogepujalejogovabol.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/d454d28e9e1c2df845e07a7795564e3f/79451700956.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/6dll9t9kn7aq3gs1jl4mioukq3/21891944058.pdf
    • https://bem-sa.com/img/file/65786512108.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb157f97ea8---63713548557.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e800d13013---xopetelesuruwob.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/okcec89tt3bo30634vtn3r3eep/rirerexopumel.pdf
    • https://copperscraphandlers.com/ckfinder/userfiles/files/41498767370.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ffc1d032d---13159263034.pdf
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/24640767076.pdf
    • http://93564497.com/userfiles/fokutu.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/3ep2indfkmcbmejdinfhutul5m/boravezuwexujigimevumulo.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/e510heb0tat1m44qfk9v123f3r/53246633114.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=third+interview+questions
    • 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_off0000ee2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 16792 bytes
font_01_sfnt_off0001063f.bin
bd311b75bb98f745f4ef2ffe6cc3a7d8879b30143e21539b33f7f4151c048f82
pdf-font-stream PDF embedded font (sfnt) at offset 0x1063F 17000 bytes
font_02_sfnt_off00013162.bin
035d4d0ca80e4d2ca334f51011016c423e9a1c1579b7357bf867afeffc7503ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x13162 10500 bytes