Malicious PDF — malware analysis report

Static analysis result for SHA-256 29bb26739997b70d…

MALICIOUS

PDF

75.8 KB Created: 2021-09-13 09:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6db770794f1a4c6e371ecff1c254632d SHA-1: f0d1379a1fedaf0664babf9a831081b3febb0bec SHA-256: 29bb26739997b70d831a2ff5f3cd51ac08afe606042110cab51a83662ffb16a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous external links, many of which point to websites hosted on compromised CMS platforms or utilize UTM parameters, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://queure.ru/uplcv?utm_term=a+lot+of+time+synonym
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/78595498564.pdf
    • http://leton.pl/userfiles/file/65777345321.pdf
    • http://afghansolar.com/userfiles/file/tafik.pdf
    • http://anabakorea.jp/userfiles/file/gowuvop.pdf
    • http://mousike.it/img_ins/files/45983193342.pdf
    • http://dmhu.eu/uploads/uplib/file/84022002653.pdf
    • http://azizolace.cz/images/file/viwudoxekibasivub.pdf
    • https://www.cascatai.com.br/ckfinder/userfiles/files/94396374056.pdf
    • http://altaprecision.com/userfiles/file/tiwupedisamodarivida.pdf
    • http://daegyung.kr/userfiles/file/20210904111636.pdf
    • https://buffinvestment.com/upload/ckfinder/files/46439339770.pdf
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/78535792245.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5975cdbc9---mabezutugigizojimonuwapib.pdf
    • https://belitour.ir/basefile/belitourir/files/tamonojikobi.pdf
    • https://balaji-technology.com/userfiles/file/88959771358.pdf
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/13021098404.pdf
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/78189006294.pdf
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/37658898974.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134aa9a2d3a2---mapakoporosejikedadew.pdf
    • http://herbwaterthailand.com/userfiles/files/24756557472.pdf
    • http://ch-yang.com/upload/files/40981017330.pdf
    • http://www.ocptecnology.com/admin/uploaded/fck/file/52496237876.pdf
    • http://wakesup.org/userfiles/file/1100122269.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/710c4fd96dd3adbd0c1b384677dc2392/negef.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_off0000c55e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC55E 16792 bytes
font_01_sfnt_off0000dd75.bin
55ed304eb9e75ebde9bed30cadf350f2841e57b87827213838895193260449f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 10208 bytes
font_02_sfnt_off0000f459.bin
8e1f7aa2bfef79534966461201b1f7e376f299743219f9d4219c8f1185d3a23c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 17584 bytes

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