Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fdb08e218f7dcc8…

MALICIOUS

PDF

96.6 KB Created: 2021-07-22 09:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d01ddd8141dd582b0ba7c74045121d61 SHA-1: cf7cc3572a604ba37a79986ca5ee3486374b82e6 SHA-256: 9fdb08e218f7dcc8c3eacd4f17a163cab23775420ce471b363edf390c7f3b907
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

Heuristics 6

  • 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.
  • 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://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce2cdc76f5---13312947491.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983a124e232---39387145933.pdf
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/pinepaminore.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/6608a4d5d6eeaded9e53b560a3b464f4/96166810205.pdf
    • http://askort.pl/Upload/file/kidozu.pdf
    • https://okazdedziecko.pl/_files/Media/file/julusepepetazewe.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/844de69e640be6456d75c69392df98e5/95253626956.pdf
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/81281880702.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa8d405d6---62957585301.pdf
    • http://mujuerp.com/uploads/ckeditor/files/20210622211153.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j2d3c7phrqrdp77lq9104l3q57/35114306164.pdf
    • http://aplus.to/userfiles/file/94627384662.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c2f6ede7b---21593311443.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/fgbprk4qgnhjgn42ajrk6t4te6/falig.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b93971247f---31378592319.pdf
    • http://dwhs79.com/clients/15834/File/18645796284.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/16c7374d52ebf591c103ac80ffe0c233/66028217646.pdf
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/31d4d0d8afdedb614aa1915296ccf350/zatajedorowikatabexefode.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fa010081---43220377129.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cafdb8c4c64---28105949967.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/92449220001.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6928c7af6f671eea684b0c489d1103eb/80949971272.pdf
    • https://lionkingbali.com/uploads/file/54279916253.pdf
    • https://kidneystonetreatment.in/userfiles/files/39431397533.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mqg7jmg16qkteihrus2gaoc0a1/filabimimigizejemojidimib.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f4a7b6648---peregotonixifazimatevadot.pdf
    • http://northmarking.com/userfiles/files/sibewaduzubegigikuxuk.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/qegmbqggk8kndb3d6m2ajod61q/roxipifumure.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=yield+of+brinjal+per+acre
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f899.bin
8b4099139eb454a35614db84905bd1915bad9bec0bced36c08063319e3e5d0b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 20052 bytes
font_01_sfnt_off00012ac6.bin
dbf52e7f8ec71a24ee1d02c6d7ff28ab45b1d07f4ef34f7869d5cf9d96e692ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC6 10600 bytes
font_02_sfnt_off000142be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142BE 16792 bytes
font_03_sfnt_off00015acf.bin
5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15ACF 16684 bytes

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