Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bf7116dad2f8be…

MALICIOUS

PDF

87.5 KB Created: 2021-09-02 23:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1577030c558c6480ad28042c8d555440 SHA-1: aed40f86ea6f75d7bba6422f0727069b547960dd SHA-256: b8bf7116dad2f8bedd62f348f4abb045eb56271c78e7b127d9b434154f6e750e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=estilos+de+liderazgo+pdf+unam PDF link annotation
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16098332965e40---todop.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/juslh3d9b3uoebloe850qmlgvk/marezabimirudaxebegoz.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/e7dq6jvdj3463go1ema0r9b5to/87866579926.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/77605117002.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///23192383242.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/54c9cca73c4f737871684cba8325298c/bufiv.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/zodimoxigazol.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/4en5h33lm8npqa6vdqo3v346jp/gonajavifonip.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b71be5aaed8---38732122127.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071dee207682---41070005493.pdfIn PDF document text
    • https://blugarden.eu/file/84240342882.pdfIn PDF document text
    • https://maisonforville.be/documents/file/deziborez.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d05726d58c---26123087070.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/589e99664a1bec685c6f3827a91227a7/2215342170.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/de3b3a3f7afb09d21b5b6a99fbebe7a2/vidupab.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b1c821074c1f90f6d0f337afe746c0cd/nodasimawajefo.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/kusegi.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/89806646014.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/ffb379ee3b3f33a6256df71a955ae963/4695389198.pdfIn PDF document text
    • http://land89.com/ckupload/files/bekirafegeloki.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6e053edb0207350bfe4fe81bb4bcd243/44080197389.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907452e06b0---lijiw.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/91697706140.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/81186883984.pdfIn PDF document text
    • 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_off0000e74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 10984 bytes
SHA-256: 129978e1d46de1b49eb32bb47f7f9d975e32ccd02e3ae4930a055e01d5850e2f
font_01_sfnt_off00010095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10095 21352 bytes
SHA-256: 6923a09d8f0f14fbb263510010661ee8626bb726c0cd11a9da325d63c4322d17
font_02_sfnt_off00013682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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