Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f6f4a07bf44449…

MALICIOUS

PDF

82.6 KB Created: 2021-08-21 01:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b44e776c0f130f72bf96e45ff6315ad9 SHA-1: 2136d905a7deaeb3a7c307a84f2016b69f6304dd SHA-256: c4f6f4a07bf44449d5d590d594ab7ddc9a66a79e584b1b9c9eb30599a242e4d4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to host or redirect to malicious content. The presence of multiple links on disposable or compromised hosting suggests an attempt to distribute malware or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16112c88faa856---lawiwutelifarasibalikiwa.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/53a0f0e2da70ef2217c2d6fcd7dc0076/95345791872.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/4e4ebc932ceea7c3f25b192c072437b7/81910569052.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/aookbp5a1egqheatlsib19eo4e/88211093454.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/33785052470.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/44222527249.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/90594171952.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/85041891022.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ce61fc5c2b1b985741694426c262f75f/68968379710.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/zibodexezokato.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f3410522b---34486815390.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/suxafafumok.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ceb479a41---ganotobat.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021071916023776.pdfIn PDF document text
    • https://marigabung.com/contents//files/45487354138.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-11/20210611122910605142.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/1277483981.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/94554791391.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/0a5849ee4b56fa2382e5b14cfa045644/futudiwajiji.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/rokalotevevuvaza.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f80c9c34fd---40851471070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=super+smash+flash+2+6969+unblockedPDF 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_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F1 16552 bytes
SHA-256: 0cf626f4df0b77273b5a5403406a027023357def16c0d87d3be22e066030fd13
font_02_sfnt_off00012015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12015 11560 bytes
SHA-256: 1e0baf1ecbb10a5f8bc197d50b1620eb8ca4a75c427a7ce6d12d3c795189903d

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