Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd4f8e450b96b81…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 16:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2a82a4c5a4a1dc1b4956c96df744bf1 SHA-1: 336f4fb820d0cf21334679d0aca6eab6d2a4ed66 SHA-256: 2cd4f8e450b96b81ae9a27edbbb2a71d10d80cc560933ca3be43b56b7b77044c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, several of which are identified as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirm the link farm tactic, likely used to obscure the ultimate destination of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://ccskin.com/geektic/files/xofufotitotegimujibenoxos.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/07ee7353d5b49e8d9730aaeeda7d8c0b/faburew.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109150905358653.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e1b697f2c---wofofujiwuw.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/xipesiguxegirebefufibewov.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/62678299937.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/zetanix.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/43588270037.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/86830294777.pdfIn PDF document text
    • https://almavilag.hu/files/files/27038074044.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/93075060633.pdfIn PDF document text
    • https://autoskola-scp.com/files/bobebaxa.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/96272035089.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/sizoxug.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/xokawiwetuka.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/13340367213.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9a624e27b---48153391232.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/ranawebowezexub.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/3220313367.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/vizaxe.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/23534293364.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/8e100a99cc9df549006d67e4d5976ec6/devosolapubupefupegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=g+major+7+chordPDF 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_off0000d840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF052 19360 bytes
SHA-256: 8f6ae31bed7e67b13c821e9031014d7a87a9f59772135f1fedffefa3050e1bc5
font_02_sfnt_off0001233c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233C 10216 bytes
SHA-256: 4c5d87be22b499d23104c14d3f603640e0e6447101303f53cd6a408fcd606c7b