Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b70decb2158832d…

MALICIOUS

PDF

102.1 KB Created: 2021-08-16 23:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dee4c901339af24682464ca4425937fb SHA-1: b9a256a0ce3b81aa0fa5ec47650794b583a84ed6 SHA-256: 9b70decb2158832d697631385a9659913b92715bfbb7eee002d5287e565dd3c1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9641

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://vinmexindia.com/uploads/volixalote.pdf In PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/41343842958.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/61e8932402d852ec31770a03e98bd750/kekegirawopilowerogaz.pdfIn PDF document text
    • http://alumnicollegedelunion.org/clients/76066/File/butedekujusawanaxug.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/berevov.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/cbfdc303779ea05fa3981614286329a8/57346975198.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904bd10c3f2---pavujugaxejutosu.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/64784903507.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b80d0665e4---42167375704.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/jirewumubederumax.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/oii0fgnrkfkfq93vm13jomvg77/39844422511.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/081319e3f627c915442fd1dad44e9151/gaziwu.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/698425577.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/liforejilaj.pdfIn PDF document text
    • http://sgpeo.pl/users//file/20472523883.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/ift2m9ef048dc2q30jv700dp2s/jukiwifotezofepevarowomo.pdfIn PDF document text
    • http://orlickachata.cz/files/files/zigapede.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/17988119969.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160a20c362b744---zisakokuludomexuv.pdfIn PDF document text
    • http://proxima-design.cz/files/file/67957294940.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///77859240496.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/lamoxezobevob.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/qqpast45uucbmdnqs93msq7tb3/ketezuf.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/wuxekuk.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/180b7ef1377baca076f91fe21b9adf60/72067932581.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/jifozajepobite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=what+episode+did+ray+die+in+the+promised+neverlandPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001073e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4B 1744 bytes
SHA-256: fe85e0a8a2678545e8e288ad89090fc3bf64d51d8303fb23b502e97109b2793a
font_02_sfnt_off00012788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12788 18432 bytes
SHA-256: 01dfc17a158a2312a47e2725bbb351a9803a0a92904dab17cbbf9486cdcf87cb
font_03_sfnt_off00015808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15808 10832 bytes
SHA-256: 4bcda35636ec8ae5058a3d93be2d08486fe33c7a1d5c31c2a4fb9085589ffda2
font_04_sfnt_off000170d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170D8 16620 bytes
SHA-256: cfc2f7d884c4b74e15891a45caa306c254ca09cef4f8eec6f8fad77adde112da