Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12cee02551826a9…

MALICIOUS

PDF

106.4 KB Created: 2021-06-21 04:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a1e4ac69e181c3ede337239183393700 SHA-1: f9f518d93916cf4d10247fd0a7044e3103be45a3 SHA-256: b12cee02551826a9eebee85a736cba2b9620fe3295bdd75cbe7979a21841797e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to websites hosted on compromised Content Management Systems (CMS) or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, indicating it was likely generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7d8950fd4---44312891449.pdf In PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609405f3e6fac---zegera.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/73617628742.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/1e2021985b2a5335dcafe25a3427dbaa/buvewulovis.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e9eeea8b221e3cbe95be005393331051/jivozopabojovovatoxemorux.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210619172842.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/tc7ldsv344j7ul5c87gvpndd6o/73933347157.pdfIn PDF document text
    • http://firegallery.ru/img/upload/loxaro.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/9271867736.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dasoxotevuduvanuvijebem.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/lupudinanibafiwujijovowa.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/gekosetowa.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608612b2bc423---feriniwozolexudarijebizob.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f8bcaf850---90830575402.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af89863041---wixunu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=in+a+different+world+with+a+smartphone+wikiPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001115f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115F 17432 bytes
SHA-256: 4a672442d802bac7995e0862778d08db5a57e331cafa39eb771a801f514f9400
font_01_sfnt_off00014a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A41 5372 bytes
SHA-256: 01dc91b02e4626cdf7a6326a238e82130c9319a2a63a2f7c168c13e6aa88f68a
font_02_sfnt_off00015c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C73 12600 bytes
SHA-256: d4dba60d3b020ba9d6e4e8c3279f60b7bc2bbbd3f7dc8762cf434c85174139a1
font_03_sfnt_off0001864d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1864D 16168 bytes
SHA-256: e5458d7b6d82539349b17fc4713a17e1381d471255c72d9f8116b7c86e08c443

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