Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7cf1b89c26370d…

MALICIOUS

PDF

74.6 KB Created: 2021-09-30 10:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e0dbb62c8118b67fa7c1b91a8ee969bd SHA-1: 21d966ae32756c3a1af8f070c8d87af955522304 SHA-256: db7cf1b89c26370d860b912a8d9880085bee939b11a8ea34badce77987f8c7d9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO abuse. The presence of external URIs and link farm heuristics confirms the attack pattern.

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://bedandbreakfastholten.nl/userfiles/file/63491485796.pdf In PDF document text
    • https://iamtimeshare.com/userfiles/file/55425806797.pdfIn PDF document text
    • http://orderkai.com/uploads/files/kagitaxesaze.pdfIn PDF document text
    • http://coumert.com/images/file/fuwadawisaburawu.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210908032959.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/sirasopufinarub.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/sexilaliwazoraw.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/suwefivewusedolaw.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/mesutikejibajesus.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613272a3d16c9---dezunasorukivametalod.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161405e9844955---lefexovonituwivubewobuv.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/detademanagupemilidir.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210928_144133_8173.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133031190027---nenobubavoxu.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/jagavegex.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/78381502380.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/52345145178.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/6950414079.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150bbeeaa57a---51868040561.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/32222999141.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/54708000136.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161355df865bbe---5998307944.pdfIn PDF document text
    • https://maisonforville.be/documents/file/8653506997.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/pifaramedupixamuzutisusax.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/xepevubojemiwemuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=2ds+roms+for+androidPDF 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_off0000bd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD26 18960 bytes
SHA-256: e6aaa83894576d8eafcb6b72bed95b9fbcb954566ac698ab38cecb657c4b6009
font_01_sfnt_off0000ed42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10559 10264 bytes
SHA-256: cef951d88f65345ed782ccf38c12f7f0249bd9c2a1d47517de672dfbfa847fb0