Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a769a07e19077a…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 22:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: abf52b4ba8fc2ed87eec990c5d1156bb SHA-1: 7b398327ad6a281abca4126d0403ed8567067aae SHA-256: a5a769a07e19077a7df91a7a3d7f92089a9727a0826fb37c3b22ddcab4ddc1a4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a significant number of links pointing to compromised CMS upload directories and disposable hosting, characteristic of a link farm designed to distribute malware or lead to phishing pages. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/3n45vk5d5mlmttnjgnkkjrd6j4/68327337730.pdf In PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/vikano.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4d397c845---34556477599.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///54104032065.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987aba148d1---81370937544.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a35824dfd5---garoj.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/2d35be48a5e47571861efcd6131e3f86/30115586642.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609842b956180---katuteju.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/23746185121.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074b959ebbea---30913435009.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e24700fac---netumuvurexukamadazeraxod.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/11450298201.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/88971740653.pdfIn PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/xapaginusulixeveval.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/1918775446.pdfIn PDF document text
    • http://rafaelokazakov.com/file/reguvume.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16072b0455719f---mibedozanefop.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/1954a2d547a9c81e2cfb482729daadcf/bomogamijafemojajidapumu.pdfIn PDF document text
    • https://wasael.com/userfiles/file/lipokuti.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/9071021997.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/simaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=syncfusion+html+to+pdf+examplePDF 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_off0000d95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 18676 bytes
SHA-256: ff97f5df136fd6b1fb8990256c910670d1a78fe3dc2a6cb35b4117a922101f34
font_02_sfnt_off0001230e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230E 11176 bytes
SHA-256: 01a7d127ca273ac7b5990dc523c95af1dce011bf48afbd7636a73221df5e28f3

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