Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dd9bc2cfe47c779…

MALICIOUS

PDF

92.9 KB Created: 2021-09-16 07:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d66188acce279333ded93481d5594377 SHA-1: 1455511735996f084bdf0d1afb3b4ba972597e0e SHA-256: 0dd9bc2cfe47c77961616e7f11deb6243d460083d8a30eaeec6cd048b2e0ea3b
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 potentially compromised websites, indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the presence of numerous unknown URLs and the heuristic firings are sufficient to infer a malicious link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d31ec245c222a4dbc47a8ecd67dde643/37469429992.pdf In PDF document text
    • http://letdentalab.com/img/files/rotunilerejululu.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b90adbbba4---weluzajuxunegefebelafe.pdfIn PDF document text
    • http://centronegozi.com/public/musuwake.pdfIn PDF document text
    • https://polytex.de/sites/default/files/16095912340.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/63695040282.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/54054770644.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/valarelagelosipikepom.pdfIn PDF document text
    • http://melabo.com/upload/files/86540197374.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/1961856648.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/bibufopurupotorej.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210905_1D3B7E65FBC7C573.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/vazaxexewiwuliku.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420c6401cb0---pinikubaju.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/dipisof.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/kobofu.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/67584381541.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/kevamirejubuzixu.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/73133247285.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e46c6bb7ad---53174344592.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/xajeresenog.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/83025649208.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/63340431586.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/jivudolilasa.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/93303424651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=frieza+saga+episodesPDF 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_off00010456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 10356 bytes
SHA-256: a52a21eea08d199829694783e8048971d089fb024fd430befe7228faa4b5461b
font_01_sfnt_off00011b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9B 19236 bytes
SHA-256: cf907f32d0473c4b346a0b59778ffdf733c59d6fc219731e1acc92f9d3a12c0d
font_02_sfnt_off00014e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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