Malicious PDF — malware analysis report

Static analysis result for SHA-256 6210b756a0ccd135…

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 06:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fbddcd57a1056d8743b947ce005a78b6 SHA-1: 0c985d892a34e977df17f04d8e102b983e401b27 SHA-256: 6210b756a0ccd135fde43891b4b4cc9c1e86b778ab51f508f9fe3758fa8df26d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://medica-eg.com/userfiles/file/65030649964.pdf In PDF document text
    • http://tobn56.com/UpFiles/file/dodalokoxuruzedugimufajej.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/k5v5oihfk0kk7bolpunst76b8e/mabanumakemoludezimugufup.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c42e672226---61139483666.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mibuzigezu.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/welulufelolape.pdfIn PDF document text
    • https://digireg.sk/upload/serokegotag.pdfIn PDF document text
    • http://rotang.net/userfiles/file/pirozirovil.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/844d130cf6084672eb7487ad9b135269/52631210520.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/nuwexijar.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/1614874997.pdfIn PDF document text
    • https://actor-conseil.com/files/file/leridopezudarinasusi.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/afdf24d150ad6c5a99bc425388604c34/76394530789.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6afa6bdda7---kixinibu.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/fcd56f458062bf2ef841a1f35c6b38c2/tavixepegobizol.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/42803514549.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bb8149218---9930115296.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce89dadecf---11574921213.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ac7e93ae7---sawigutu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1efc4ef09f---kuziperafarofesukaleba.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/84432734052.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/078df63a63f2fc80d78d5281cce577ef/suserumowurekuwedusax.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/mibubowalugiluzedagijemu.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/zosopisusuvifosuxuvawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=complex+analysis+a+first+course+with+applications+3rd+edition+solutionsPDF link annotation
    • http://irodori.kir.jp/files/file/nutugupiwe.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_off0000c9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DE 11488 bytes
SHA-256: debbfd8ccd629a9c64f1275b7a6a57bbcd58365d45c461476009f287a489b7c1
font_02_sfnt_off0000fd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD00 18168 bytes
SHA-256: 45b17a8e16f214a4ec61e86a50305c4dcacc16a5671f2a3e63ff1d869b605a43

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