Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0cc72bf4fedd88…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 03:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f468a9913f8c9f9165b24af7accdb6e1 SHA-1: 7d9dfa5ee099f399c0329faa13d45050ac8cd90a SHA-256: bc0cc72bf4fedd882e455f9ebf4f11c5a105367a45d7014a1df128ef1bfe19c5
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 CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://cbgnfinance.com/userfiles/file/44547770594.pdf In PDF document text
    • https://przyklejki.pl/userfiles/xafet.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/46113386186.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/65555894657.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/ranukozivajitegegamezu.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/21062098810.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/88694711177.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/68737619170.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631377893nezudakulelajalu.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/giwepebepiteb.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/62178335492.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/dalavusoxuxasajewiv.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/penilowomosoweb.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/mozodifirole.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/22764354629.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351fa1188e4---84087686595.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/denupizisarugewumuvexu.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/dipewixol.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322a08c5133---10912133203.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403841a0b1e---sataroxi.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2dbb0351e---34865528420.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/89vcmlo2up94sa44n6cem2lriu/vuxarizof.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/debizoloroxowosefajo.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/56535707007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=jcheater+san+andreas+edition+apk+free+downloadPDF 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_off0000d7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C7 17560 bytes
SHA-256: 89c2f04eb1687c11dde090152f726f2c9da6896ef6b58ae06231f082d6d35ed7
font_01_sfnt_off0001057c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D93 10884 bytes
SHA-256: dea68183972e1f4acc8ade8e05bb5e35343ca4ddae687860d5ec782940de15aa

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