Malicious PDF — malware analysis report

Static analysis result for SHA-256 e94fcce94e290006…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 02:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8465d1c4b641087f9d724ef2135c7ef4 SHA-1: 1371730142b32783d6ab5e16148c255d9215b199 SHA-256: e94fcce94e29000684b2c3b6e16ae9bc8e388edd60b93a1d3b6206e7a1975303
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The embedded JavaScript and the link farm structure suggest an attempt to redirect the user to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://medvor.ru/uplcv?utm_term=afoqt+study+guide+free+pdf PDF link annotation
    • https://evergreencans.com/userfiles/file/gabewijiretiwesaluj.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160de25ef8e28d---71735459329.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/gosafalokuwikele.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/47154422690.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/76099208665.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/digarevojetabumuv.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/35981237200.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/pepivadasetawej.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/poxijaxapevalet.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///20216291643548041.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/lolekowis.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/d1fd4dbbe5c37eb7d810469c0c0c410a/21987183634.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/4a58d3383cfdae61bf1ece781d5973a2/43279133988.pdfIn PDF document text
    • http://garderoba.sk/images/_file/kemugegatudurufox.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/e16846e12016d6664871003fce04a278/66625013601.pdfIn PDF document text
    • http://puisan.ru/uploads/file/naxipogutuviveravibexogor.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/ruzozejalozi.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/d6a7f6aeed7d1e24e07f59fa5e3be6e1/janew.pdfIn PDF document text
    • http://capableapp.com/uploads/files/80999548926.pdfIn PDF document text
    • https://onlinendttraining.net/files/44553827629.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/zisufadiporebufajadezekug.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/duronerirexonasunopemupom.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 17768 bytes
SHA-256: 4ab43a93c990f268c026e086250fbc7c9bfb38236a49d438a4dfce6a52c21ae9
font_01_sfnt_off000107cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE4 10704 bytes
SHA-256: 709ff06bb8f95812756d5fb92f72a5b559c65218c6d9733c75e08afe72ecae22

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