Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66a9044735e7587…

MALICIOUS

PDF

84.8 KB Created: 2021-09-04 04:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d8564fec331c4d7d26b5342d5ab8146 SHA-1: 60bc2825c31866017f42431fba940b4063193415 SHA-256: d66a9044735e75873564515b06bb155cade096da505e1c5ff03068805df4e652
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, embedding numerous URLs that point to compromised WordPress installations, likely serving as a distribution point for further malicious content. The presence of multiple distinct hosts and the use of formcraft plugin uploads suggest an attempt to obscure the true origin of the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a49faef89e---goroxikanokiba.pdf In PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/fagukadalenu.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/49346271339.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/qp6fkqvps643ib9sfetvuiraj4/7234998982.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d65117179---12946062926.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609edc982cad4---misabalefokufuwelunukugex.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/64505283972.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/43468316063.pdfIn PDF document text
    • http://fygl.net/uploads/file/151510001662.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/wetokusawopuxapigo.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/99557731655.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/geluxudifapev.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/o3f83gvbthuoq07oug244e5ksj/9585873427.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/41029120050.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/26959306105e43e91e2d14cf09990af7/46394947403.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/lavozob.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/37808503377.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a260ea274e1---21990592357.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125dc0308ff8---lepez.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/fifumipegeporilare.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/41829186771.pdfIn PDF document text
    • http://yulintimber.cn/d/files/92906878707.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea756b90d9---49328815556.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607b339ed828a---jixivugixojodidapojulad.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/zenexisedozavezovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=abra%C3%A7o+de+pai+partitura+pdfPDF 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_off0000e031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 20388 bytes
SHA-256: f6f5cdc4b93179834a3b01139f379d243f6266a7ec4fd7b780e7d1ed01526531
font_02_sfnt_off00012b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B81 10592 bytes
SHA-256: 24d988d6481024477d12a946c4cb5604c8530258b99bf79b32d2c56550f758a6

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