Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea68afb90db4ec3…

MALICIOUS

PDF

77.9 KB Created: 2021-09-24 03:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81614809b10e6eab41139f3bb17567ef SHA-1: 152032bb489855b066467567c9c4cdbd7182b237 SHA-256: aea68afb90db4ec38f3c9d17f211d8075665d9f21a7057577cf3c316577d3e0f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The presence of these links suggests an attempt to lure victims to external sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://medvor.ru/uplcv?utm_term=how+to+mirror+computer+to+phone PDF link annotation
    • http://sm300159.agchost.com/userfiles/files/68164943929.pdfIn PDF document text
    • http://vln.nl/files/file/mexokebezuru.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109221959089919.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/97996437554.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1614b27629a5c2---72011084706.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/rft9irndi8mqvgrecu4e0gtjl3/kajowofokipifoboxoxetajep.pdfIn PDF document text
    • http://pronobile.com/catalog/file/jibufamunevuvezigipa.pdfIn PDF document text
    • http://one9five.com/userfiles/files/gaputezuxe.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/54355568886.pdfIn PDF document text
    • https://laser123.com/geektic/files/19614641046.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/fe87b5af8eae36991d7f5e0d9e3e1616/podojelo.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/mewufagunimegepopaz.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/66711279530.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc55aeca6d---gemefilarutepuvigotemovin.pdfIn PDF document text
    • http://fabtur.ru/upload/files/nowakidafuxijeguse.pdfIn PDF document text
    • http://888chji.com/userfiles/files/geginowejarokasiju.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/lejag.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/joles.pdfIn PDF document text
    • https://tpk-m.ru/files/file/kalifibog.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/28800326332.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/pevuxa.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/zifopav.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b87d13830---kulubaxibevat.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/fawulazanifigakewevejasuj.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/22931779385.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD009 16504 bytes
SHA-256: cde05b1a58c49b27dfddd406bbce79fa0e64ebb9cb3f132b5b82ac13b88a3823
font_01_sfnt_off0000fa66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001127d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 10440 bytes
SHA-256: cba4c6a9e2a0da48c7f3c60abcb25e16af4a82c1b7d52848639e04097cd028fd

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