Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f42e43a3c0175c6…

MALICIOUS

PDF

84.8 KB Created: 2021-07-03 09:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13b1f2a60dbbf34b8b27f6e3631621ed SHA-1: 3be5802295e66ccd939df56f07b12a6c35ce3968 SHA-256: 8f42e43a3c0175c64a0fb24c7bd851bbdd711fc68272e4dbd1ed8613b251ef2e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that redirect to potentially compromised websites or disposable hosting. The presence of these links suggests an attempt to lure users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cructi.ru/uplcv?utm_term=dcf+valuation+for+startups
    • http://coyada.com/up_images/up_images/vusanux.pdf
    • http://forter.vn/hinhanh/file/gutubopigabatoxijemor.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f806714bbedd86ae789bfbcef27a6fd3/zovupelu.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/k4avdf1qgj2n3vjnkqfm7d16s7/danomilotaj.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/ea16eea77e27a238b40ad35719217b8f/filos.pdf
    • https://clickkedai.com/userfiles/file/58637651072.pdf
    • http://heyibnb.com/CKEdit/upload/files/42416008959.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/ff70be845176fff38c0ea5f9e5eae871/16978950711.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/n5n22fmd6thuuef1s8e85e2bu4/metukodawazovob.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/62b922aabc252be4bb21aa73afbf2aac/67428203819.pdf
    • http://epmachine.ru/d/files/vesiduri.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160836d0aa18b3---22364181167.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/232hhppcaa3illf6uq8r479ur4/moxumidavonedusokiwilizim.pdf
    • http://banghetretunhien.com/media/ftp/file/71332986537.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/beweb.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609829fcc3654---lumuvare.pdf
    • http://agiusfuneraldirectors.com/files/file/nurekinoxogilamegujet.pdf
    • http://abovomedia.hu/_user/file/dovefasog.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/0cf53f2f81c14d90c791fdebd7bd91f9/livap.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/0844369820d5c56f2c7601938faedd4e/87691764562.pdf
    • http://atdawnwelift.com/userfiles/file/53140478030.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/84672827113.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607d24a5888b6---82933567807.pdf
    • 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_off0000ea07.bin
1b6970879d95cfcc0ce77707185c003b99471cfb84075c001d3f820d972fc6e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA07 16944 bytes
font_01_sfnt_off00011612.bin
e607aa3f22e0876770619773bcdc28a12dd4e6d30791c6542f56b1409dc92b35
pdf-font-stream PDF embedded font (sfnt) at offset 0x11612 10508 bytes
font_02_sfnt_off00012e29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E29 16792 bytes