Malicious PDF — malware analysis report

Static analysis result for SHA-256 b090e4230d6042ce…

MALICIOUS

PDF

82.5 KB Created: 2021-08-19 15:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b05a39563e7c7674e01c3702a8a061f5 SHA-1: eefd1850ad7830e6192f7d94df2d5d2b7168f4f2 SHA-256: b090e4230d6042ceda18244733f5bc466099d6094d9cca321d059c60312a90a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of external URIs and the overall structure strongly suggest it's part of a phishing campaign or attempts to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://ketchas.ru/uplcv?utm_term=fahrenheit+451+quiz+part+2+the+sieve+and+the+sand+answers PDF link annotation
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e55a0a041b2---fopofaminodim.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/7184410692.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/dizefodobopefa.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/vewejumogumo.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/87381353918.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021072510313873499.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/dojaw.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/f280cf31a0b0be3c0f1a92ba4ede45b6/60809349030.pdfIn PDF document text
    • http://glassick.com/userfiles/file/jekumagi.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/2osvffeb3guq56btjjuj174fdq/21602427112.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/95398328272.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743dcb63d30---bodifomipelineziromitu.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ef20949f2e56485332eb65b60a8852a5/52778042386.pdfIn PDF document text
    • http://abnicum.ru/files/file/62187277558.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/31701976167.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/60958077109.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/49962882431.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b20ec8fa0---74208506312.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/68463172624.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fbb57945c---57546091967.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/575660902.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/1938489553.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1cd40d13c---10056403887.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/d0065879cfa306e8028263433056e398/24858593073.pdfIn PDF document text
    • 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_off0000d95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 11144 bytes
SHA-256: e546a00007007d8aafb84431654cf66703b407d60322cfd6eae01b10f2deeb72
font_02_sfnt_off00010b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B71 18672 bytes
SHA-256: f94c7a1df23f8bb463d7d5f3d43d9b0e8f535d39e0765bb1a79c7cbcd2e58f1f

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