Malicious PDF — malware analysis report

Static analysis result for SHA-256 792300431aea7e50…

MALICIOUS

PDF

74.2 KB Created: 2021-06-25 09:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70602b03b8e0ec1cf37cbff9569bd1f6 SHA-1: d99f3c60b6bd4bee601127778184fa37392ce252 SHA-256: 792300431aea7e50817a660e776d6e7f5d333b4c4153cc0a5b5d22069d7fa7d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vipforiraq.com/userfiles/files/15600577985.pdf
    • https://peterdegendt.be/file/41610652198.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91ac8c3071---tujasodedijimajavu.pdf
    • http://guchenes.com/d/files/balixum.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a081192a90a---dafaw.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c93979bd82a---73438277883.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160783da743bed---71592902064.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/vqlbu78kdfkp8okndptgjsro15/fagefuvovilijob.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62cfa271b8---lixukagagetuna.pdf
    • http://jinohair.com/upload/files/59761169861.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2vtcgqhnltp95mahk9uqbsdrd0/bigofanazowukerulete.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/t0tr5fje0cgv7346fi74csq4lq/zafefa.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898a9c55ce5---74767994073.pdf
    • http://zuche0551.com/upload/file/vafagiwekesonop.pdf
    • http://nuraski.pl/wsg/userfiles/65655769740.pdf
    • http://biotop-zamosc.pl/userfiles/file/jajizosisufi.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/8j81k5rgdi9gsmauhuaf4aed6r/nedidepoxixewol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=activity+1+reading+comprehension
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e2.bin
95b5dee9d9534e9ec781405c4f17e9babca6117ffb2c9d75cd99bd28103b85da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E2 5660 bytes
font_01_sfnt_off0000f910.bin
ffd52b36e37e664d29a2f9aa94a3d81acac81e6d67a984c8dae93badd739b1a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 10236 bytes

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