Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b06feaf9c4ee50c…

MALICIOUS

PDF

80.7 KB Created: 2021-06-16 01:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2cef0512488840e4a12f7a3c033e17dd SHA-1: 94ea143d2a5afca2961c8d15eb01789a9d420d49 SHA-256: 7b06feaf9c4ee50cb255c2a1991039ddae3627a7866d053761eaf467e0046f2b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://archism.ru/uplcv?utm_term=game+of+thrones+garden+of+bones+full+episode PDF link annotation
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/ukfmdr31h2i4hokr19r2a8edo7/70056750874.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f511ecb0b5---diwidujazepaninanogami.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091426db952b---91911983661.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/60717860775.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/vabovasufegepoxuxalon.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d873286120---borixegewixakugo.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160abe561562f8---60391438168.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa67699b3c3---29595775251.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16084c26303e3c---26428120474.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/maxegebu.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/da28e2c912bb0479991e44bec2143b65/88550304559.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/30abd065fa118eb7ae79915e1a5076f9/gojowijusovubez.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/8bd1823bd845ac641a196694e5ca4efc/73984165695.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/vategexixulesaginex.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae2e1a574929d3e9bac34474e1db4447/51667148856.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/81092332112.pdfIn PDF document text
    • https://actorconseil.com/files/file/lekarale.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/21151599364.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE23 5624 bytes
SHA-256: 5768712034c81b951b804fd4be253ed7a8ef97b45ca245d191684ba1994c60ea
font_01_sfnt_off0001111a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111A 10748 bytes
SHA-256: cdbb56000cb8971d03ca7d1640d2036d2c34c5067913ac357031e20c672c789d