Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7c418ed925b685…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 23:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1612dac199257cb3c59996fc9d1eb00b SHA-1: 94840f3a511bf42290dbe48c61406bb5ee5789ae SHA-256: fb7c418ed925b6856659bd73975b11e1ae0d9289eab121a6a89423c4728f7e27
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. The primary purpose appears to be redirecting users to other potentially malicious documents or phishing sites, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/98c6bf515f1b7a2825bb0425e572ca92/nizibagetup.pdf In PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/fimujapawelexozogadevit.pdfIn PDF document text
    • https://avela.md/userfiles/file/11851890323.pdfIn PDF document text
    • http://htwy.com/upload/file/zemanavixipogidujogol.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9516c0b13---xovajuzog.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210810_211021.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/73003009588.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/98804114652.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/63663897631.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/76977198470.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/36600748891.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/69h4p8bd3hg24s1vm53022b8i3/42173813227.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611556121f8e7---vovegewalador.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109040333491548.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/46722804838.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/ddc7dcda4d5849f4f7f495b3ca1aae87/35754322292.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161002ce11fa77---lotazuwilojiv.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e82dc884---kumadelirepugasowumigunib.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607760e43ba53---81002798994.pdfIn PDF document text
    • https://kurtwohndesign.ch/userfiles/files/31705584888.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/poxemom.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/kinigibaluperiparodize.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13599572551.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/45425291012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=transamination+and+deamination+of+amino+acids+pdfPDF 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_off0000dcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC2 18392 bytes
SHA-256: 80ddd96def140e78f560f36767bc8898259bdafda6853d9c8901a4e66f2eb6d0
font_01_sfnt_off00010c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C68 10700 bytes
SHA-256: 76757e07114a2f5efc683bf7c8125fbc83f35373785fc5a432a2ddad5d4231ac
font_02_sfnt_off000124f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1