Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac04eb0ba136740e…

MALICIOUS

PDF

83.1 KB Created: 2021-08-24 04:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e4ecc4e63b1ee12c4fad39e36c7e06b4 SHA-1: 94266d876d5282915ac2d28a3af33bb3ee331fce SHA-256: ac04eb0ba136740e8aa8fa706de9cd0db5d41646fd376f473dfa9befd8c5368d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to a link farm hosted on compromised websites, likely intended to redirect users to phishing pages or download further malware. The heuristic firings indicate a pattern of using disposable hosting and compromised CMS uploads for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://inwebjor.ru/uplcv?utm_term=he+has+or+he+have PDF link annotation
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d186e611ba95fb03d442f725bf80b72e/novaxinidekiweka.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/tubaparowunej.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/m52juh0qki5bvbosfm8287b852/wipajuxobexarelafotinedun.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4089e304bd---49467678114.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/xadebuninuxevegevuli.pdfIn PDF document text
    • http://cartopack.com/Images/file/nuzonuvamakukuvefavan.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a968fe1f---39221546254.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab1cac64e7---4093538096.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/pekedamen.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/muwazabuvixa.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0d7517a42---22913811144.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/14678806147.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e47ec8fcaf---befulimimexaris.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d24446337---fatomodefabijisaki.pdfIn PDF document text
    • http://cpils.com/userfiles/file/6013803251.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/sawulonujowodasotezi.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607461bd439fe---dipafetu.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca12d0ffcf---xalemajoba.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b26053b1155093e9ebaf51a57b8d24ca/nobufobi.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/guwegawuvogowi.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/65376795361.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9bb4aa349---gufakud.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/padovev.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a1afe6024---92987056926.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_off0000e4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CE 9924 bytes
SHA-256: 09013ecec9bb056f347f50789876b93b25ed9b017f92594b535e9c95ceae2610
font_01_sfnt_off0000fad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EA 16732 bytes
SHA-256: 56960c8e1b870d8c7ca5c16fb15e866639ba23d1a3978e96b150fdd0696a2951

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