Malicious PDF — malware analysis report

Static analysis result for SHA-256 73961bd8bb99a663…

MALICIOUS

PDF

76.0 KB Created: 2021-09-04 19:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6b3e5b9d8699ab59733f176ab668abe4 SHA-1: a512024a264a2a16a5b82836b4306dbc0e7549d0 SHA-256: 73961bd8bb99a663326993c7f4fb46f7e175bc7f37f5ad46a0ec86a0cfa9c278
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous links to external PDFs hosted on compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/ba67886e22ec2ffc215bb4a0972bad3f/lizokilidivodubisesalo.pdf In PDF document text
    • http://maduraigarlandshop.com/userfiles/file/89279529869.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/94177002413.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae62214e01b---9984692811.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/2ca18e2a40358e876e14f83f049564e3/7641473601.pdfIn PDF document text
    • https://virker-ikke.dk/files/pakejupavesenatazilo.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e6f9d1881---pilun.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/2632586327.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160871457b630a---susixu.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/fba018b0b46b4431ca36aa7fc8942b23/minudigowaragutanaxu.pdfIn PDF document text
    • http://rhondachem.com/d/files/penewutodijima.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7a9e78b75c49ea40b8f7f97a1fd4b12c/wizaniwigerobutiw.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/bafafapupisitiminagutilef.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/ef255947b8c41540a50d83138a29c123/jinadud.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/86481538855.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/bc63e1af88d325d9ab4ce30a9b89473d/pefobotebavixejepus.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/sefojudezipizam.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/3326103ed1cfa361866069a4f60929ec/15375751734.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/60928552948.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa70d3e9e52---sedukapuribupisa.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/liruvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=acofp+inservice+exam+2013+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_off0000c27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27A 11252 bytes
SHA-256: cd9511319fff6a47ec28b20eaa311d5136b0bd89624adb4ab2ece74f9150de58
font_01_sfnt_off0000dcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF511 17704 bytes
SHA-256: f084788c0d7461d01826588e0936eb9697563c6304b56ec656760bfe1cf10e73

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