Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e342be30c9acd3…

MALICIOUS

PDF

89.1 KB Created: 2021-07-03 00:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d771f9e3a95198e77d5ae9a2faa9727 SHA-1: ee5cf86a45b8dc713ff97d15390dda91486186a9 SHA-256: c4e342be30c9acd394872fd0d35ee5f3593ad67e649714f900e72ffeda2dd07c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis to the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://vietsonplastic.com/uploads/userfiles/file/63950795787.pdf
    • https://angelsforwarriors.org/userfiles/files/39932936640.pdf
    • https://loyallcanada.ca/editor_files/file/bukilabak.pdf
    • http://travelport.pl/userfiles//file/86815496106.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a70fc866472---guraverugevoloji.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a08e3168df.pdf
    • https://gadd-asso.org/userfiles/file/76091235186.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bbcf8191d---93749623907.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/civ9h5h4djlanflqrkvelm86ts/50915253763.pdf
    • https://yingzhaoliuart.com/upload/file/bolivun.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844a8bad477---rafonabapizuvekudi.pdf
    • https://oklogistic.lv/upload/file/xepiwi.pdf
    • http://train-in-japan.com/images/blog//file/98035835845.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609191f531a2f---29911688686.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/379ae10c0ac29b91dc61e1e740043ed0/jexigove.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/337f32447965595f099c93ca307d3e19/tunajulovozotu.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/5074cbefc1540a01052e85e3e350bd9b/judidibugaxawezij.pdf
    • http://sk-uralstroy.ru/uploads/files/97684700011.pdf
    • http://kirilmazbardak.com/userfiles/file/gefigeteno.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/930d4bb9f630b14ecaa6db372abc8459/69771229339.pdf
    • https://liniagdanskzydowo.pl/files/zisokuvuvodawedivu.pdf
    • http://cbcom.fr/ressource/site-image/files/sixuka.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f68d90af8680f3c3b8ba2c6450d8de95/vozisokewenojob.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/laaahrsf04io3cso183rtf0n75/zezizozefuz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sand+and+dirt+delivery
    • 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_off0000f5e8.bin
9b778d5518564f1f9d7338dd730e4a199649189622d970f1e06a15bd268db8b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E8 18972 bytes
font_01_sfnt_off0001286c.bin
fa904b50e3cf0f3a5d8d0a1d8f8ceffea4545b6bd903d0a188925eafbd222180
pdf-font-stream PDF embedded font (sfnt) at offset 0x1286C 10208 bytes
font_02_sfnt_off00013f72.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F72 16792 bytes