Malicious PDF — malware analysis report

Static analysis result for SHA-256 862049460a5979ec…

MALICIOUS

PDF

78.8 KB Created: 2021-08-27 22:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 37c4d4b5e509d4adfc4b57e204cafa4b SHA-1: 189ad2dfc12732fc66754268085ef0d1311301a4 SHA-256: 862049460a5979ecda7630182ce9e0a14aef9d36e534b8b47892d111fe95eb1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://markzone.az/wp-content/plugins/super-forms/uploads/php/files/l9048luseh3pdulod8vqvfd54e/venimewitokazebefosa.pdf In PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078be0c8b3a4---97769425258.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8676e7204---35151427634.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/5da2bcbc4c991b904162a2ceb03fa7f5/danutizobaziz.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/90050fd9d682369bb2b2e7502ab84d5e/fawobo.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef419a2f67---lozirotumofuw.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/94sbvdb706gno00r2h7gc7g8vc/zifekanewefiwebit.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/67912488154.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/4eea1420743803110e1b8bc209a9f4d4/31775575615.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/65lhf6lre592quesl8ir1endt3/70231874034.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/37074b7be5dabac193436f75579c4b8e/dafumemenavejuzubop.pdfIn PDF document text
    • http://signauction.net/userfiles/file/99184724381.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/jaduluwogoleki.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/fe56a26ff42fcc0e5f117c9a2bd2f582/lijutopesaja.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/tirizalavevemilov.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/fupotuzuze.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/siralijipataxulupo.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085875e33768---vexanoxuporedixuredimu.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/pavix.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fe2e2826---2266471732.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/71a1973f06b8f3c62547f98f0c441351/kerowomano.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/45733217798.pdfIn PDF document text
    • https://ebooksweb.net/files/file/97112855646.pdfIn PDF document text
    • https://samowar.me/upload/file/38650258430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=black+and+decker+all+in+one+horizontal+breadmaker+manualPDF 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_off0000cfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE9 10912 bytes
SHA-256: 4bc9320cb159ce05df8808a7217c0e21585f6e3666279778d6126eff241ecdd9
font_01_sfnt_off0000e903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 17132 bytes
SHA-256: 7dd4803367010d27611d6df137943acb7431db9552891f81e7f06662dd9a9b76

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