Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd50cac37ae4c63e…

MALICIOUS

PDF

85.6 KB Created: 2021-08-26 12:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7cf94f81ff7426de36dd8d6608709781 SHA-1: e4255e06d4af9bfc780a8569e1ffd368d9c2bdf5 SHA-256: dd50cac37ae4c63e6174d1a227a7a6d6e70868f59c56b500acc70e2206db07fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/uq8beh1ihiib69qlh12uid8br1/xisosutigifulutexanaxap.pdf In PDF document text
    • http://yaqeen-eg.com/userfiles/file/kagesafekemo.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/35266622984.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37f7f61e86---29389050432.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210715_210548.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/5q4u5ah9ogpc4v0lfbmb0b54gv/22973239957.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608c428971f0c---39425224758.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1064bdc49---52990089091.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/garejizov.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/bf12cc810e2440a08500e162bc728bc1/xuluwesumokelo.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/34574335540.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6dc539602584f5f756ebff2e9f0200ea/runajutu.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/47592574046.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/zamonibomulipoxofutaso.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/29767992585.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/fisodetodemidopujuvu.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/44197222466.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/01e3a42f36663c6e3bf71b08c2e8247b/69076009822.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/483bvfokm9n8h87v3jf4h0ao86/fotozimebuxe.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/9902746516.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f8fbda5ec13a061d58079d14316dfea2/lidigufesuwutojor.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/kewibevinijojezeseselik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=square+jaw+womanPDF 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_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 10400 bytes
SHA-256: 0b567f5b770038c5c95dc6f94e9a9860f7e5677585bfcf91be2cbd5b6e75d355
font_01_sfnt_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3E 16928 bytes
SHA-256: 881bbd9acc97ad14005f8a9661f21ef5a8ac64569ad7b436f543de1c11b750e5

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