Malicious PDF — malware analysis report

Static analysis result for SHA-256 084a8daae4b6b776…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 17:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: affa0f60dd332ff279a6fa592ea3fda3 SHA-1: c4c452308dbd5498ee8b901f85a01b24ccd124e7 SHA-256: 084a8daae4b6b7760e60c5cadeb13b81bf6d7aa59c6f9416d03056106ab70153
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and heuristics indicate it's a phishing lure that prompts users to copy and paste content into a shell, a common technique for executing malicious commands. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8080cf476652d7b90380f0276773fa9e/93884131615.pdf In PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f229eb5d10---talapekidiz.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/94122529568.pdfIn PDF document text
    • https://goodline.by/userfiles/file/bisonotenufopebifuv.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/47506839228.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f475271765---gosav.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ogoxixiluregudak.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/guzobinumixikodufojig.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/jutizox.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/85810463186.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/8a2cd33bd6dc741190525926f2eca929/86920530881.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/db655af8c068e8d7a6b5edf9d4c1fcff/norasawonosuserivisajo.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/17901571252.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/08e85daac02a1ef960d5e331f0c4ae9a/78820560881.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/39a6bc387c5a3a6be2500ab1b97284dc/wonapoxu.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ef5f2c250---4417671005.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/dumezirabumuxavufikedaw.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb54071bce4---kepigirud.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/91563662328.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8cf86a22b---77327551260.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/46c842cb8e587d0d5c867dfe8d614146/gegewak.pdfIn PDF document text
    • https://baongochoa.com/upload/file/30515345012.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/39540501642.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/simoo2r4s1hsr7ecap43ns07l3/62572134152.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/nakomumozulesuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=text+to+pdf+windows+command+linePDF 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_off0000d0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FE 10832 bytes
SHA-256: 2b81a3da4b0ace4fa331154691675b319c1f582f20b2095a05d1004c37970a36
font_01_sfnt_off0000ea11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 20708 bytes
SHA-256: 9fee2bbd646c304065a9ca1cbd0c3dedf6c6facdef38bc71c7b08b52e66cfc6b
font_02_sfnt_off00011f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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