Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab50b25e1b510272…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 11:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a5157fba062e8655b789dca37db67bc SHA-1: 5a3930e7ec9f0e847f23cc1f55527092d0f4cd0d SHA-256: ab50b25e1b5102724ac0299e36d3cf75223ef1dce78a1f0684c24bb777482146
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sledovani.gpshlidac.cz/www/userfiles/files/59650267557.pdf In PDF document text
    • http://oris-am.com/editor_up/79908906160.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/22373556956.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/xevegovanadivokuzatav.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2005d03cf---75923718009.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/xowis.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/kavidopaferixavame.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/sinarorutogoj.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/1526029120.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa4f31ae3c---xafojamewojunino.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/fazuxitufaninagirag.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/71720054598.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/85941679755.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/18315546977.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/wasuzifelolejano.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/vesozewuxawewojet.pdfIn PDF document text
    • http://meteoratourismactivities.com/files/files/87113207619.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/78657083577.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614de95b3f6a6---fodomexitiru.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614596ba57cf1---87372178818.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/42485966997.pdfIn PDF document text
    • http://df-2.de/images/daten/file/70807959662.pdfIn PDF document text
    • http://ciskmv.com/css/file/2229340322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=watch+raya+and+the+last+dragon+online+123PDF 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_off0000afc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC8 16052 bytes
SHA-256: 57b654866a62a0b2577a8aea1a0c672db6ab4827fb153449560e723e75d4468e
font_01_sfnt_off0000d886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09D 11100 bytes
SHA-256: fb44d552a6245c5be4a03d6c7867683fdbe9be011d7065380e4ecb33b1ce78c8

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