Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a67883a3fb84518…

MALICIOUS

PDF

70.5 KB Created: 2021-10-03 00:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81c3f2a1d527a341f4639289ef8969fb SHA-1: a31ac86719682bdf51fb43c2605fd8e237effd31 SHA-256: 4a67883a3fb84518ecd9e531e7a4fbe4e3af327656357bb716b5bc99ab722c49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The embedded JavaScript is likely used to obfuscate the redirection or further exploit the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://drafthe.ru/uplcv?utm_term=northeastern+university+tuition+fees
    • http://skolky.info/foto/images/file/7454244115.pdf
    • http://kim-clark.ru/files/file/2799644601.pdf
    • https://ap-qatar.com/userfiles/files/fifum.pdf
    • https://partroyfuneralhome.com/partroy/assets/file/getutofajababavaboniba.pdf
    • http://triatlonbizuterie.cz/sites/default/files/file/61508983339.pdf
    • https://servingltda.com/userfiles/file/xupugorapawogi.pdf
    • http://kamienneogrody.com/userfiles/file/84324932992.pdf
    • http://markone-tools.com/upload/files/59460917940.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613112eeaf186---roruz.pdf
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/roguge.pdf
    • https://gberwanda.com/gbe/useruploads/blogs/files/xopanuga.pdf
    • http://grandviewgroupresort.com/upload/files/pujuxemunolalajuxan.pdf
    • https://twinscooking.nl/twins/userfiles/file/wutetir.pdf
    • http://webbuilders.com/files/file/22849503226.pdf
    • http://laarakkers.com/ckfinder/userfiles/files/vozijowobokatej.pdf
    • http://syarmarka.ru/userfiles/files/99156782568.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ov58jd156i385v9rrbpc14bma5/22510889895.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/davokodiregujajifano.pdf
    • http://www.kotolantopeni.cz/files/12191343667.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/lekozufad.pdf
    • https://vegas-shop.net/uploads/files/71283912934.pdf
    • http://kohaz.hu/files/file/rulogisefupafazi.pdf
    • http://lagrupacio.cat/file/jitelebegabo.pdf
    • http://ibb-online.ru/f/file/xavopusideg.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614fd5496987c---26447198055.pdf
    • 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_off0000b209.bin
76977158766950a66f967e54c0d1a0f56751f1039c2d9d903d859ee65ba0ad95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB209 16796 bytes
font_01_sfnt_off0000dc0d.bin
d40833fb3ec86ca71cf12f95568e4b4e25719632fc06df5e3907713dd36b1af2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0D 10524 bytes
font_02_sfnt_off0000f407.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 16792 bytes

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