Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e8e1f3851265cd…

MALICIOUS

PDF

85.7 KB Created: 2021-09-21 15:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 787559ad6b8cec7bfe8a60ef9bdc6d47 SHA-1: a9e181afce6b9974e90b993e5cf5faab303d3650 SHA-256: 59e8e1f3851265cdbed1c46067cfc2a5f09c27fd63854611b999e625e3fba4a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being a link farm hosted on compromised WordPress sites, likely serving as a lure for users to download further malicious content. The presence of a 'download' button lure reinforces this phishing-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=print+pdf+automatically PDF link annotation
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16145d101634d5---sekumi.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/93969296931.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/30352042198.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143546073795---kofowex.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210910093743.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/furipefakijewidugeju.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f01a4fc47---menojuwalugumeb.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141d648ccb4d---varexiwabal.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d52ea692b---jatapoxeremaruvetefesi.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcdaf52a35---forajizajoni.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/zuvobo.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/42671256454.pdfIn PDF document text
    • https://krossi.ru/images/content/files/xagemejugupufi.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/39926100634.pdfIn PDF document text
    • http://hinodanang.com/uploads/image/files/56836520267.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dce395472---44534252618.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/rarasobofunifetalejepire.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/dejovokavax.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/65418598641.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143c0d1680b1---lotidujokikix.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/xewetovimavunazijure.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/67366002828.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/dujifazowidotupe.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/bukorulugiri.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/vunobo.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/51938467472.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_off0000eb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 17264 bytes
SHA-256: 46ae172073434c2d2958c7f66905186366407d48387b2aac3271f3db3cdd4c4b
font_01_sfnt_off0001189c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B3 10696 bytes
SHA-256: 3f024da7c77c768ea451df3c7e08c95ae8e1f802feac9f824ec3246bc902d83b

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