Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e80f3ac77c1c3c9…

MALICIOUS

PDF

89.0 KB Created: 2021-06-25 14:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d40bd068ccc738816d19d71220bcfee SHA-1: 271047d0a4680b70e101c07ad2f45a4661832e4b SHA-256: 1e80f3ac77c1c3c9fdf83d401bd0cf1a1837e23daba2199a2fae7326aa4daac4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. While no scripts were explicitly extracted, the nature of the link farm and the PDF's structure suggest it is designed to facilitate the delivery of malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc30f100d97---sotoxinoxux.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bec154894---6546714165.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c97453056de---bomisakod.pdf
    • http://qkmedica.com/uploads/userfiles/file/vozifewi.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/2d65cd83b1b834d2e16f3181898b8946/54098572913.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/655d29bd48d2bdf02b4b864448f91e58/839661781.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32d2f7b4ee---51177253133.pdf
    • https://ajitcoatings.com/uploads/31776887237.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c3f85c157---jomopoludedotovopusovel.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609167aa449e6---53703957898.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609df92f221cd---jumuvidukerutu.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dcfa7833f---laxojepa.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/eugerq2k0ppoacru7c5bvm8cqf/35331370039.pdf
    • http://auto-spec.ca/fck/file/rogemejigawilusot.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f7d2976cb---gusogasewewodowozixupax.pdf
    • http://poltinka.ru/userfiles/file/virizekedegoridefewe.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085db893aaa6---6933283349.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=short+practice+of+surgery+bailey+and+love+pdf
    • https://doi.org/10.1002/b
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de93.bin
87f798c69afde62681d979ed163523ba52c8ad05e11d432867b760011f4d1b09
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 17444 bytes
font_01_sfnt_off00010c37.bin
1ce54f33c8a2f90663254e00152082668fb745f1c1f06c50d7ccf419c4d5ec13
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C37 11396 bytes
font_02_sfnt_off000126a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126A4 16792 bytes
font_03_sfnt_off00013eb5.bin
a58fd7af834c63890c18215782fd0f35eb180609aecb5aebcbdb56e2d32851d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB5 16836 bytes