Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8b087fa9ba7359…

MALICIOUS

PDF

76.2 KB Created: 2021-09-07 02:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7536796d08b69f27aa294ba764ae3ea9 SHA-1: ed94835a5d0799df1122db58df132cfbc064b54c SHA-256: fb8b087fa9ba73595718a51c37826068358262c7c7dead1b78d6c09fe95bd79b
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://ghioroiu.ro/sites/default/files/file/latowarozimaximog.pdf In PDF document text
    • http://artkulinaria.pl/sites/default/files/file/53677989148.pdfIn PDF document text
    • http://deauville.ru/files/file/goxoxudupi.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/89668688260.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/34374950554.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/wunasisokemorazimigar.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ab53fb9a80e408bd60c5bbd2898aefcb/piwuwo.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/17064768848.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/321f506b261c1a43d3b3a5840f55615c/30430795887.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/99997814181.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/d0c468451c66b9e1287efb9b99e2aba7/49965875757.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/vudexareduvemipudozegotos.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cc000e801---29769697377.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/61434095341.pdfIn PDF document text
    • https://birotex.rs/images/files/fowakavu.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/kixoxogurexevavizexapot.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/gozegu.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/17023623800.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/bumediribafenatunanudiba.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/lhhduta0nurnn9njtgl1hr1qt8/wofobokezozoj.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608328d260230---9462711718.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/57737409168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=fundamentals+of+python+kenneth+lambert+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_off0000c495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 11096 bytes
SHA-256: bf12712acb3d7ca40426afec8db200710b86f9e444f447f54ab50e1756531a7a
font_02_sfnt_off0000f629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF629 17384 bytes
SHA-256: 6d1e06d9cf0361132c61c3b9473937c7f508d99fccad30c4fed6195e127b5f70

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