Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4dc58a751364c9…

MALICIOUS

PDF

87.1 KB Created: 2021-07-03 19:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8460b67892f0d0eebaca6168fb29f5d4 SHA-1: cb000023f504eb5afb1fc97f3b8f44f0a869be5d SHA-256: 9b4dc58a751364c95395fbdda47fefedc5c94f580563fccae7fdb887787522d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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://allytemp.ru/uplcv?utm_term=319+country+code
    • https://apc-algercentre.dz/ckfinder/userfiles/files/fufilexod.pdf
    • https://canevastoilestjean.com/upload/editor/file/bexewuxalolixitibudirazid.pdf
    • https://rowadalbyt.com/userfiles/files/69076087114.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/bp9b4og992ntl5e105e3jdvip1/31032159243.pdf
    • http://ahcxdq.com/uploads/file/280432104429.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/910rgvcnjgkhb679ai673edob1/bakadopasalejosipigevodi.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c8965ea5cf7---ruxelijudu.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/3f4f605a51445cc737dfa9c859feee46/32909649449.pdf
    • http://giadinhlaurenso.org/upload/files/63750145906.pdf
    • http://www.pics4us.de/userfiles/file/53565328490.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d83f08380fc45d6e007cd146ba43145a/78168483945.pdf
    • http://hanhthien.net/uploads/file/46394097013.pdf
    • http://minhphucvietnam.com/uploads/userfiles/file/78304597188.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf54e4b728---marovidivonojazibuxal.pdf
    • http://masonhn.com/d/files/53986158249.pdf
    • https://menlopark.com/wysiwygfiles/file/95696285779.pdf
    • http://architettogherardi.eu/userfiles/files/veretalisejir.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7a78fd3649667e21183b94d7668d605c/24116768549.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a35b0cbd4---bavidux.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/cfdf42cc68e2c8e395a6d3f138577f9d/vabejofoxipobefuvajugama.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/qrq7od9psjvft4a7a6o5ujtsfb/bolabudidivugakikorik.pdf
    • http://buren-kompanie.de/userfiles/files/83548507948.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087511b1eb53---vidileguruzudarodixezu.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_off0000f193.bin
f375b2508a9b48d3b04ad07b243d84bd6c955ccd3720fba60589effaa3727080
pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 17664 bytes
font_01_sfnt_off00011fb1.bin
9e00117179583ec6292bf2a1ff93ba58f7a7762b95fa07c34a408968d048e614
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB1 10404 bytes
font_02_sfnt_off00013778.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13778 16792 bytes