Malicious PDF — malware analysis report

Static analysis result for SHA-256 b190aa7b2e128b60…

MALICIOUS

PDF

75.5 KB Created: 2021-05-30 14:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 774479d61ad2ccc6192d11f16cff9696 SHA-1: 927abca470b354a836d993b2325f2df507f58187 SHA-256: b190aa7b2e128b60cd5392deb2004afb7c3de3bf17b124724e2177469a95bb8b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as hosting locations for further malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure suggests it is designed to lure users into clicking these links, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/f99bd76311663f5898b98d47ef9b32ba/guzifujidukobadepojotud.pdf In PDF document text
    • https://avenue102.com/uploads/file/43446270278.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/3a120fa26a00b4ada6d878b907521774/10349481197.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile/%5C/2021052215080942.pdfIn PDF document text
    • http://splogservice.ru/content/file/momukikupo.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/82650682109.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc6ac3e28---jijomifapakilarafakomuzud.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608380fe8fde2---98171937640.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a12aa8c86---sanegugotavumadodeseji.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a61a50dbbd6---65045972655.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/kumijafanatuteni.pdfIn PDF document text
    • http://rld-carbon.ru/file/15817124786.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160abe5839cd35---kirerawod.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/94ndge7rvtr3dkbp3fc7u6k7o0/42378633982.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6cae196de---60430374163.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/272ebbf0f8199e9ddd66b8ab1157b2d4/62217004489.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=using+algebra+tiles+to+solve+equations+worksheetPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE717 5420 bytes
SHA-256: c1e7f1fde264101d8a289b14879c18948ee3dcfb2c335ab7e52ace2e38550f60
font_01_sfnt_off0000f996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF996 11500 bytes
SHA-256: 793b97d699d596560ce62f4472eb17d007727fce815eb46ab71e24a1aaca3e10