Malicious PDF — malware analysis report

Static analysis result for SHA-256 97dfdf8dec2808ba…

MALICIOUS

PDF

95.1 KB Created: 2021-06-29 16:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fbef036bb515d130818ea584ebfd553 SHA-1: fc838100734924257417ed269e2fbd76e96edac4 SHA-256: 97dfdf8dec2808ba612087ba8479d143e814ce7937bcf5c4f8f056a9e3c98c4c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV heuristic strongly indicate maliciousness, specifically a phishing or trojan distribution attempt. The primary function appears to be directing users to potentially malicious content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://sambometal.com/dataroom/file/17292863297.pdf
    • http://zulassungsservice4you.de/bilder/file/bigoxumunafifut.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/15418127313.pdf
    • http://kahounova.cz/userfiles/file/palifonopafe.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4d92cdcba---48522394274.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2178813fc9---vakoriboxi.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/5v8tkrm3mlchmfj6v0jsorg40p/31734625587.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/o4bv8c2hp15et6j52dmqn8cir0/tozagiselofox.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a33dae9694e---58591368393.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a437fb6218c---farezotak.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af92ac64743---beropuvonob.pdf
    • https://amatnieks.com/pictures/image/95773127829.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/34dddf835813ec6055accfd379560dc0/lagolipet.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160afae711e21b---bawagoxabekok.pdf
    • https://asthasupermarket.com/userfiles/file/gofitelenul.pdf
    • https://people11people.gr/uploads/File/xapudopuvemozafinamewe.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a1c2a20650594856b155ae9cccedfbba/wulosaxedurejipow.pdf
    • https://zebcom.in/userfiles/file/27928058231.pdf
    • http://karimeh.com/public/userfiles/file/kizuzulid.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608431b4cbd21---didazufazategovodatetogis.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/45292696283.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed6268d221---zitozipolexewunekir.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=valentina+tereshkova+first+woman+in+space
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a8a.bin
d1569b55ee9d8518f8ff281faed31cddff1815c9b4c4892db92c05d1a7d5b8cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8A 20040 bytes
font_01_sfnt_off00013e06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E06 16792 bytes
font_02_sfnt_off0001561d.bin
b810d452b61cfbdf4dc6ad569e7c2c09420f30f9d67d110c858322c1aebfa7f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1561D 10960 bytes