Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a47e500164a839f…

MALICIOUS

PDF

84.5 KB Created: 2021-06-26 02:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6096439094a953d91da0ba7e52cbab6 SHA-1: c8501d3c381b286abe1fb69324d32f8492683459 SHA-256: 1a47e500164a839f94df43546f97c3c01f3e25fb8efaec43893298c231a699d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure for downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ctyrkolky-gamax.cz/data/dokumenty/mejusirokibegukoxotu.pdf
    • https://canevastoilestjean.com/upload/editor/file/44465417665.pdf
    • http://berbun.com/user_img/file/janixexerigabojonufosuv.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e22417429---bejunuxab.pdf
    • http://schokobrunnen.com/idata/naberukaxikid.pdf
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/96127663861.pdf
    • https://twr1115.net/files/fckeditor/file/3487661781.pdf
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/70566456997.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608154a70a657---dukikusufenokek.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/1838d65cf49dc43cb6c9f97b4e9b7487/pabofamojewegemilujavixu.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd879d581---59627499903.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160974f1bc0578---72514704798.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a460a5ccdd---sizubabelawafusimipezofeb.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/bpq9o427sf7tb7kljf4encgscg/belagamoge.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/084d57aa4e4c0b9d80715a3e405cc229/zimebobodebof.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/e8bfdd37a3b33df8bb66bfd6f4fa2969/81742175553.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/rd0ahif23etl8tb95gjsl0586c/7000035235.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/062ae7632df3e5254b00076dd0bb690d/68849852176.pdf
    • https://acronimocostanzo.com/userfiles/file/29817277249.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e893825d04---69760495209.pdf
    • http://czdashan.cn/uploadfile/file/2021042913582673499.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af137705b89---7567918279.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=books+download+website+free
    • 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_off0000e6d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 16792 bytes
font_01_sfnt_off0000feed.bin
99c3e1e0cf7d89c19b0d1d3c6a3960d488f57caaffffe47b8540aa84e6183c21
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEED 10716 bytes
font_02_sfnt_off000117c0.bin
2339713c05c10cda0a96f4c6fc80cc77b9628aae990c2edb0b9127f0a404c1f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x117C0 16836 bytes