Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b766f9124be55e…

MALICIOUS

PDF

102.5 KB Created: 2021-07-17 21:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d6a6258f87ba17043f7bf2e80208b78b SHA-1: fb8b190f9eb04b77bec28219355fbc4995dbc6f8 SHA-256: f9b766f9124be55eca0bb8b55401a6e4a9483a7e18debedcfeaeed78fdb489a9
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially harmful content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/27b96d509abe8644cab2ce9bd30da48a/81484549183.pdf In PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/cubqret4lcolv0ds2u98454u8u/zemomunetidipepazo.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/76895448393.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae75e4a849c---nusekuberexuveriwove.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/paxotip.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210621_080131.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a98e2119c8---bibolajiferatuji.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dfe7040a9---debasilawete.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ktj91voqb8o10fcpg4pbjpm7ng/zagifus.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/acnm9fjtu3ovibq68s01ooa7t4/22977784756.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c85d291c6---67583900937.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/nrh5ocvoicg7t8v7j1pvg9fsu8/pasusobezam.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/1480a9bd5aa724189a7cf1446cbe41df/85136893048.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8d387d6cd60d2406f759096d98764fcb/6778508611.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/52460996373.pdfIn PDF document text
    • http://thedreams.cz/files/85651451097.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/pesole.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/b52b9eaa295e15a60338837dde95eec8/57802609761.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/19900407747.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/5b8176a3a3732e924cfa11bb8563ae59/64715758719.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/lelonix.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/aorrqfi1p8904j90s48tqv6db1/guvamakepibinubebujeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=exabyte+wifi+adapter+driver+802.11+nPDF 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_off00012f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001474d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1474D 16528 bytes
SHA-256: 8f16185193da6507b825abbd2fb440e8c2fb4af92bd6886b20a2c38d56e319a6
font_02_sfnt_off0001722b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1722B 11216 bytes
SHA-256: f1e0254ffba0a479775d808e260aee947aed94646bbce3fb194c5b5afd1adced

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