Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f35f12f8af6e28…

MALICIOUS

PDF

80.3 KB Created: 2021-05-07 02:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d381ffb705e72360971852df210ad057 SHA-1: c74a1010342c68e32721f496c16aec9284e33c13 SHA-256: b6f35f12f8af6e281b7a62392e9900190669c8e127f3a902b3b9d073e25406ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's part of a link farm hosted on compromised CMS uploads. The document body, though heavily obfuscated, contains text related to 'Ignou assignment front page', suggesting a lure. The embedded URLs point to potentially malicious PDF files hosted on compromised websites, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/27c155164ea84fd7a76f4b8be8aac09c/39884238713.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/c12b58022fc36b033ec4e09eaa60a355/wonusejitixu.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/ecf79f9f09e0042139af1397a870e5a2/xemixumufumewik.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607db19a2961d---figozobefizugewafedosewe.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160900a2ad77ce---paxovuxorofob.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/j5frcric88r9gqisanj37oscq1/38692395802.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3dd292b706d3a913de1ef4a5ae544bc2/nesepopimawojemajogin.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%252Ffile/tuwuwu.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/4c7ec53451d2cd3ce70152fc3acc5030/lujuji.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072caf9d2e3c---45485591650.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd55ff2921---sozuv.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/m97duoie3pe044jl1dtg73kuju/piwupiriluxuda.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/3lpk92s00cdr7mklakiums6k5t/pusexesisufuw.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/00a9ff69bd1cf5bbe7ece2ebe3419ffc/37794624919.pdf
    • https://arhometutor.com/userfiles/file/jamepusajoba.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9e57cce23dc14121979e42e0dad12d61/revinozavo.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837be43a3b2---ninevapekobojubatepudel.pdf
    • https://www.guffo.in/wp-content/uploads/2018/04/front-page-ignou-
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ignou+assignment+front+page+2018-+19+pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e602.bin
54f44d331bb8ca021efaf8eabe8cbe0567ca2088b9dc06b99108c2d46db827b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE602 5856 bytes
font_01_sfnt_off0000f9de.bin
2d95319709d09b311859c89cabdd971ebcad3c55507c98d80df4ee2d3166af72
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 12664 bytes
font_02_sfnt_off000123e2.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x123E2 4324 bytes