Malicious PDF — malware analysis report

Static analysis result for SHA-256 97dcd6796f1b3da2…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 22:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d13a13a71eb16962c41f930b2bcfaf12 SHA-1: d6d856c8458b07877094cb5ba70a4dc9835807af SHA-256: 97dcd6796f1b3da2497dcc86807db36e1c5613cc7d1105a4d7bf46f81030f5fa
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, with a specific detection of 'Pdf.Phishing.Trojan'. Heuristics indicate the document functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites. The embedded URLs, despite some being marked as benign, are part of a larger infrastructure designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2bd57643b1---17571542359.pdf In PDF document text
    • http://canvangdientu.com/images/file/pimifadexisezuv.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8023e10d16---35079489091.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161108ddb953d1---pijifolitegozur.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7acabc567---339103458.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/3929161829.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8fa45bb4a---71188449165.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/wefafajuked.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/a8b2294d723f91b7679204d92cca7ce1/tafititiliwodif.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/51738526051.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/24215555099.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/83084495354.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/57963308237.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//segolugoti.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/23797758207.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/nosomututozekidumukexug.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/45116232581.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093126c5ed4a---nabejubuwiximetejepiv.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/97453493780.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ee3b7c3aa---navodizuwogivudinepofax.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210805_799A7F5B34C7BB59.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/695fe56e2051a8e6f02ed3cad513facd/42721434282.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/60542b225473cdd1c18b8633d2e67adf/91442447699.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8509643e89---widaresu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=repage+pdf+onlinePDF 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_off0000dcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDC 16996 bytes
SHA-256: 8a7d9b1697b597c4bd1545d0cf08df77aa7f60d54d88cf9dd3dad220f6664948
font_01_sfnt_off000108b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CB 10352 bytes
SHA-256: a99fa818668bfcaae34350309085bf7a4109d0042b0e3c725401d8938524152c

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