Malicious PDF — malware analysis report

Static analysis result for SHA-256 575fc6b07c5d7cbd…

MALICIOUS

PDF

124.8 KB Created: 2021-07-04 18:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 79405507c5c11cd7fe66d4308ec5dc01 SHA-1: dea0e71d0bdfc3c09a49e4a724c88eb425d5540c SHA-256: 575fc6b07c5d7cbdeaa41b9ad0a173de51b5e0bfb200e5973d48da12e0032532
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9651

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4483c240f5---taxedituvabexawopaz.pdf In PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/m4j2gc8f453op9l30rnfir14v5/29501493303.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/11574356166.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/l6judompgafa3dsi0jrhlqrh71/videsaparakevotudinakal.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/vlnnu8b0r59587no4j7ccirkh0/29585304918.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a92368c4dcc---nurivobogisazuxida.pdfIn PDF document text
    • http://susanirvine.com/clients/82887/File/kuvizabuj.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/bumipibabedam.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/9db53775d7e0eff8c22cb730592e0e23/kojolibagajulesatupuwo.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/4297710ceaf7e1dff5172a1ff6128062/91942415803.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/250313276373.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/tetugamovirejozuxovedozop.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7cb4899fcf62e157cfdd53a655320008/zefomenetejefuzoze.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/1067a8ad22504908304e5a16e9660e1e/64682474836.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/8f32331b22a0d2dbebebfdc4bee7a46e/bebibimodifu.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e75d1adfe---18902336499.pdfIn PDF document text
    • https://bachson.net/upload/file/77562968542.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/uv1dqb4v8b791geq13hm5g6j94/zipixemebezow.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075c25d0f4af---lisodakezijibop.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084de768d58e---jijefi.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e4747adb3---15183828148.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/7708np23mbakpqtd28nd6hu25t/tubotuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=a+fussy+personPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000179cc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x179CC 31180 bytes
SHA-256: 22720bf421533e42a37541adf78ec804c6d7b8345e22f198aedad69f3867498f
font_00_sfnt_off00010a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A75 10412 bytes
SHA-256: 5b7773e13ccbe39ae0676458722126c54ea6df6f7a7a404b10b529c42b8213de
font_01_sfnt_off00012c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3E 34640 bytes
SHA-256: a865290be7850e1cf76538620277f13e2ce5f18e2051f7c5eb659978eac2dcc5
font_03_sfnt_off0001b626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B626 10148 bytes
SHA-256: 7691f2e7476629d32ae0fb002d9ebff55c24057028eee0d6108116340c998b57
font_04_sfnt_off0001cd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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