Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b86bf60739fb39…

MALICIOUS

PDF

91.1 KB Created: 2021-07-19 08:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c62864575e127900a0bb16610d47b13 SHA-1: 73d2668dd5d5090755cec615be6a26d8a65fc31e SHA-256: 33b86bf60739fb39a3c7f16d5823a25ec6f88245e0185095d3731fbcb3f81f1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. The file's structure and numerous external links align with a spearphishing attachment used to lure victims to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/920ce219c2d889821b28a3ad482f882d/rolimusukerijasowudukiko.pdf
    • http://driver-jazda.pl/upload/file/vexutareluno.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a14b0bbd4ca6ecaecf4003a628fe67fb/xosodudokimodudebekepajus.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fe8d04059---roregesalulolumobodut.pdf
    • http://ulsantour.com/FileData/ckfinder/files/20210716_52E49A93417CA7EA.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/6cf3411775d10a3375ce18cfefa0820d/norikometotubesijobinajo.pdf
    • http://moestuinwebshop.nl/userfiles/file/komuponemiburoporisag.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160bb906a012df---49139907877.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/7fdc5b93d5bd1b7cbca9e76132b8d2bd/93523941852.pdf
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/riworusomerugogenotuwol.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/99c51577b11c7be9453adef26785b542/lovumurara.pdf
    • http://antonio-pelella.eu/userfiles/files/95384145737.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0179d3ff1---kinimekok.pdf
    • http://changwontour.kr/FileData/ckfinder/files/20210611_750C13359CFACCD6.pdf
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/35010386297.pdf
    • https://euforbiabulgaria.com/uploads/pages/files/zijafazekafikugineko.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ed2fc5d66---subupovajom.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d0d587b41---kobowepasami.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765bfdd26ce---xemowuna.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a0b04959b---vamagida.pdf
    • http://tiendanatacion.com/noticias/files/41791384238.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2446a805aa---47979015672.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/c0dc77936386f5e8adc0d59c8f901c50/69085296444.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0123bbb2---gexifunepubuvuveneb.pdf
    • http://z-i-f.ru/userfiles/file/retubabozojofoledu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=simple+dry+indehiscent+fruit
    • 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_off0000fb13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 16792 bytes
font_01_sfnt_off00011325.bin
a8b2dd6a5f328cd62ce13e26248f3f9181d35e1a7c831716e89584bd8a563ee7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11325 18804 bytes
font_02_sfnt_off000144a1.bin
d6ad7af389f6f8ca94be4bbc57198adeb21dac215ae1e931959f9511b2622a21
pdf-font-stream PDF embedded font (sfnt) at offset 0x144A1 10892 bytes