Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd228efdd877e01c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-03 23:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 04ea81416c01ba2d9c988281a45b3e06 SHA-1: efb7dca76dd57fecd0ca1cfae328cc0a7a174cb8 SHA-256: cd228efdd877e01c83508313bd32cc161da5962cad497ead684effcfce2fdebd
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. 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 0.9977

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://oniceh.ru/uplcv?utm_term=analisis+de+mallas+en+corriente+alterna+pdf PDF link annotation
    • http://akcjonariusz.com/UserFiles/file/wunenilumorulonu.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/d0dpurpnp1pk1sj5dsimnv7fa6/bulexil.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/20965341437.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/lexibej.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/xisibuvifivuzuwifamususa.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/442345eb2986b46605a7144fec3831cc/xefigegopi.pdfIn PDF document text
    • https://bursac.net/userfiles/file/13036274499.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de8d051d319---65289042368.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/6317b469481abd94c83b11fc0fa11b22/pafatasizidizodatubufanur.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc4b517e82---20158554464.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28aa283ce6---kowukokizuvibeketusodo.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/gipukepezijevibamexito.pdfIn PDF document text
    • http://orthodoxnews.us/file/97434594392.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/40383615053.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be85ac7f4be---jagat.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/59168190925.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/wovipulenuzuripib.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/60716721264.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111a6013c493---5841046045.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/91250591959.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/cb27947488bf56a3d44b5e5e76e28419/83074110350.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/gagowufinilodigizini.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/ligujoposesumofuwevada.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_off0000d243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD243 10760 bytes
SHA-256: 7b078db667c28c1a8791cc34aed661dbf9308bac1f13454f6192fe66739a2366
font_01_sfnt_off0000eaf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF8 18900 bytes
SHA-256: f27e8026d4db0708dcf0ea03b6b175ba691fb8c76e51504e072931329ef58ac1
font_02_sfnt_off00011ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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