Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b43976b328ea90d…

MALICIOUS

PDF

87.5 KB Created: 2021-06-17 04:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ca262ba799d5e2a82c68c6b02a7f69eb SHA-1: b68a5215c2817446ba8bffb57ed6652fb3110149 SHA-256: 6b43976b328ea90df984db01bbdffe9a681b5974e52a5e74d2578b64e3c18518
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The heuristics suggest it functions as a link farm, directing users to compromised WordPress upload storage and disposable hosting sites. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a potential lure for 'Mechanics of materials 9th solution pdf', likely to trick users into downloading a password-protected archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://coretry.ru/uplcv?utm_term=mechanics+of+materials+9th+solution+pdf PDF link annotation
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a8aa6ee7a69ef6bf67dba9bd3737b016/rijunovaxulixejej.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/waxegokawi.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a5e86a730---zakarokasupujaritogez.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/hddo469c7vbsqeo324fmlhovn7/rugomijir.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad3aeadb66---nimuvar.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/goxumenojasede.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/rajumigiw.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/xavofopumu.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/36066102992.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16083e45f9c628---gonotapodolanatali.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf3718ae85---dupokorizojowusomuseki.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608742dcf0d12---92545842291.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/7a4a3129674b2e10e45588fb08182205/vikopidukuvegofi.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad92ac849ef---48080214374.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160817b3b663c3---zosagewokugidor.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/2dd780df2e8a03c833dbdf9b39328e01/7722215908.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882bee3563e---kalisubowiwakepapefoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012bba.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12BBA 20672 bytes
SHA-256: d368ea321d660361f002e9b1e2c9e9598bba3f9ed3a58d28a9910ecf150d0f54
font_00_sfnt_off0000f439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 5556 bytes
SHA-256: b61bb490d697ca126bad090302b934e5e591660be9f2ccc7191eaac883045f6d
font_01_sfnt_off000106fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FB 11036 bytes
SHA-256: c7e4d100b83dc2372ed08307c90c5f2a54590f1d1a94e2d4fbfea0319d3c4dc8

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