Malicious PDF — malware analysis report

Static analysis result for SHA-256 6591f82f360345e5…

MALICIOUS

PDF

89.7 KB Created: 2021-06-28 18:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c5547a0198e53148f58a16861b7fc69b SHA-1: 2d69eaae93ffa86fff38f6f56e07c43e9eb15870 SHA-256: 6591f82f360345e539e9e61fd3bbc667897de0848b346cd8325b52ad18e751dc
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 a link farm, pointing to numerous compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely a phishing or trojan delivery mechanism. The document body is heavily obfuscated and contains no readable content, suggesting the primary function is to host external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://mishelik.ru/userfiles/file/kusozegotudosowepinexu.pdf In PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852ccb53507---fujunamalugadazodeni.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073adbb59fd8---69896224030.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/340578082b484c2202658c56ccf18242/fadiwukiketepu.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/76629325130.pdfIn PDF document text
    • http://edgecs.net/documents/64083680976.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/xewunobojemofiv.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/e1249a0f8e839e77b5bb7fdf59a62b1d/89067685383.pdfIn PDF document text
    • http://webbuilders.com/files/file/dasodedaxaw.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/da1f7f33c46735839528c72c570d88d9/zikobuxexepekejimodelaz.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a7db2cf3a---35082378558.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/pojerulbhjo7hgh3qlntd7vok1/16538264020.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2461dcbcd---45939451191.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/lepibopamogoligigerip.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/27586022085.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/66064199484.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/golojigodaxomubozipalu.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/j5l5qu6a0j8f2aa707i4r7sd6m/93252888397.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/nowubiwaxevu.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/587346226.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/kadedu.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/puwupoxu.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ee3b375a4be3dc464b5ccc04ee598e05/panavibu.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/josefabuworulofigiker.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=different+types+of+non+contact+forcePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_01_sfnt_off0000fbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 10540 bytes
SHA-256: 3e9ccb319df5f8aa9a0fa88316abb4c3b6522734ac468e9b1c7937a6a1e14b59
font_02_sfnt_off00011423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11423 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C35 17064 bytes
SHA-256: f881c9be665e3ed270588bbe8a84d2ad330e47d1f5219b14f9ee869525c87262

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