Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fd197e0eadcdd5…

MALICIOUS

PDF

78.9 KB Created: 2021-09-15 17:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e5184704f2eb4dcbe441caf02e1629ca SHA-1: 04b022b0769e027df3fb00928bc9591b413e4208 SHA-256: 73fd197e0eadcdd581deb632667f5fb26229c7afd8d049d8b99e2ece702517db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming, suggesting the document's purpose is to redirect users to potentially malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=miui+12+update+in+note+5+pro PDF link annotation
    • http://adidravidar.com/ckfinder/userfiles/files/56443897280.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/45244572454.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/1a2d575b0b6b54e4ef80498a61cbe1cf/gagesoge.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/83522858107.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/jiguwodaled.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/viluji.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/59629882518.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/29516162069.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/89436929146.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c209494f4f---42780439906.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/5518248790.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/46665778789.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e306188861---47286352317.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/sosojikow.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109040423133162.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210912101717_400304391.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/0tl5okkr8ldp7vk61boqj1aa57/54509610043.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/xokadireguvinuw.pdfIn PDF document text
    • http://linker-apps.com/files/19450197930.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/74173854124.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613b61c5e2f78---xevixodusikatorokimad.pdfIn 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://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_off0000cbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE402 19020 bytes
SHA-256: 2e929d5ddc070382cea3d0a1bc5b010ba89570004e18a45f597447ab9533a7f0
font_02_sfnt_off0001163d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163D 10572 bytes
SHA-256: 571ec28765e70d7327886bb5efa7d9cb18a9244d6e10465b50caf40bf5cd36b9