Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd6d91142d0f199…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 19:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b22916a9721262340b9c1544c6a5211e SHA-1: 45b32569e5a9d7ca1e87c53f465299a0b61f482f SHA-256: ecd6d91142d0f1992c9d281171abea66b6f56c02521ac896af7b0a54610dd3f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs are designed to lure users to these external sites, potentially for credential harvesting or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/0e416ddfaacf255ef2006f94c152c3b0/88241471143.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/8uilic428jvafqis87i856r6ag/74705690535.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607564a56c9c5---tawevurajoxezewal.pdf
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/zuxopamopiti.pdf
    • http://chinalabware.es/d/files/zemerapixufabo.pdf
    • http://www.sictombbi.fr/ckfinder/userfiles/files/norafufewovuliw.pdf
    • http://sevimticaret.net/userfiles/file/nikazaned.pdf
    • http://nage-z.com/ckfinder/userfiles/files/nazizudimesisatil.pdf
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/tojufuperadasa.pdf
    • http://abwingsva.com/uploads/files/264232903.pdf
    • https://doxity.ro/ckfinder/userfiles/files/30230580404.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/03d79953dc0e971011e09f22ef1680db/setumetijelovejote.pdf
    • http://hz-karavany.cz/ckfinder/userfiles/files/55411287818.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/k0981um7g81n570mt5q80m5ri2/78053777481.pdf
    • https://ontech.vn/images/ckeditor/files/39479867444.pdf
    • http://innovatepc.com/userfiles/file/50021211075.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/witarofokebawaxugalebu.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/ceb5d2113c130837d50649c605a44971/47031998353.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a897b1d3616---punojolorejevobuzujolij.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/kitizipufenevixevume.pdf
    • http://soldearenales.com/galeria/files/19834980804.pdf
    • http://autoscuolavalerio.it/userfiles/files/sikajoxijewo.pdf
    • http://holzbau-napetschnig.at/sonewowikarediteli.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=yamaha+yzf+r6+2005+service+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF68 16792 bytes
font_01_sfnt_off0000f77a.bin
b84ddd7687b14753d812fcd35f19903ff4c494fe4aa7ce075dc23b6a7f74b193
pdf-font-stream PDF embedded font (sfnt) at offset 0xF77A 17576 bytes
font_02_sfnt_off0001256b.bin
a1479cb56577837648e1c140db91c4b4bf9edb3fb039d233a4883714e0e44f88
pdf-font-stream PDF embedded font (sfnt) at offset 0x1256B 11252 bytes