Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6988f12079fad18…

MALICIOUS

PDF

80.6 KB Created: 2021-06-29 03:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26f3fd85ac1a0f7adea43dc62d2b534e SHA-1: 20e824870c4dd6ed072889671e2aefb8861917c4 SHA-256: c6988f12079fad1883e1005878429d4eaeee8b9533e0e122c5879d2d0341cabf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, hosting numerous links on disposable domains and compromised CMS uploads, likely to direct users to further malicious content or phishing sites. The presence of external URIs and the link farm structure strongly suggest an attempt to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://aldara-latinoamerica.com/userfiles/file/87224621475.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ba3a3058c---72760676119.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/fae3d0d0963b255243ecafc271a9d93c/kupobajefod.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160accf6a3b39a---86267907298.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9952016c35---sufof.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608018f45cb76---saxewukozokawaguv.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/dbraq6p6093gkooq9fk388cpvo/36832091517.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe2cd4c4d9---julaso.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/2e6d8c8306d55f0c14482e65bd8d49a4/42970212344.pdf
    • http://gospelinamerica.com/clients/874377/File/bonidokuvakekinafu.pdf
    • http://matras-devison.com/upload/file/mumafujem.pdf
    • http://abacusnancy.com/userfiles/file/25473771913.pdf
    • http://ibtaker.ps/userfiles/file/36564517924.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f688f68701---xubiwiximixanigutugasupor.pdf
    • http://tfforming.ru/d/files/voxaragafinutekagarunorot.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/718b6ee33835c0bba7132320581b3c8d/77190355599.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087c2b4af7cd---bidubilefogidugas.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bba952d407---zaxub.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b89621e2---tozukelaveloto.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/60855c569a616614e73f8b2266a52f45/bewubala.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607543043ae88---mazanuwela.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/9d31792aed7a143c0fc1bbdb97ccb352/wogot.pdf
    • http://files.ibiza-ferien.de/file/74938341551.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9d8343b8f---49480760672.pdf
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wizijakuti.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=fast+and+furious+hobbs+and+shaw+subtitles
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d170.bin
5bf1613f65b895e62d73379fd30b5f50c488f5f6b0bc38d9c3b3a2c816373963
pdf-font-stream PDF embedded font (sfnt) at offset 0xD170 19880 bytes
font_01_sfnt_off00010419.bin
475ecd41d4322e74f56a15dd945271f74f104f711263cbae73c63e0c142ce164
pdf-font-stream PDF embedded font (sfnt) at offset 0x10419 10756 bytes
font_02_sfnt_off00011cc9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC9 16792 bytes