Malicious PDF — malware analysis report

Static analysis result for SHA-256 68dc2fc73f347d88…

MALICIOUS

PDF

77.8 KB Created: 2021-09-05 18:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc7fd4e7b8293af3f3f88bf64e2ede69 SHA-1: a569f54a0c288e55f8fec300d8cc16b9771949bb SHA-256: 68dc2fc73f347d88d5df9a22c4782494f009820c4d62c2b9c58bcb104f786b59
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely serve as a lure to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/pu3h5uj2t620pkslul0ah0mhse/8777301102.pdf In PDF document text
    • http://bluedevils59.com/clients/862365/File/koriwotixepevemixapofut.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0cc526a837---66734273029.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/zikegaleloxotuwuribuzomu.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/jewaxijomajumelonuda.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd3a21ec71---walaxesutupefalubetul.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/83177213285.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/talaxamoki.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/56855484230.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100490453dc3---gabawopojolezemo.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/029dd2b8e867956e60956f595588984e/81633588148.pdfIn PDF document text
    • http://salespate.com/userfiles/file/40936262182.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/xegemowat.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/69363193865.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/90138179162.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cf4556aba---6060333049.pdfIn PDF document text
    • http://epicridesnepal.com/files/zudimugasepasibag.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/41355628995.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/wijijipoxozukuv.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/97167621935.pdfIn PDF document text
    • http://p-energo.ru/content/file/rizomamamafapanogunatexos.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/73035295b00651cdaeb0c758a18ef2aa/xukadugobazune.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609250ce0bb57---50297441915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=livro+de+ingles+para+viagem+pdfPDF link annotation
    • 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_off0000c427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC427 10764 bytes
SHA-256: de0b8e40d39bed639c8b8278823191aeaca9c389421d442495121abc79c255ce
font_01_sfnt_off0000dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA7 20980 bytes
SHA-256: 2c942c7f016e86700bc799e671b4c8e44d1c6cd00659a385d423f1c2a10e8808
font_02_sfnt_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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