Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ce64f9cc76ef55…

MALICIOUS

PDF

79.0 KB Created: 2021-09-08 06:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8b4720be36786b3a6a598e813375bb53 SHA-1: 981e1e1e484f75702cfa514165de9f17186f5b33 SHA-256: f8ce64f9cc76ef55bd37b88de5f874a6d721b0acbf1f6c02722a8a460df2e8a6
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.guus.edu.mn/ckfinder/userfiles/files/60683981460.pdf In PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d1a1a33ae50e4aaef511380126fffd35/86607947232.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/81243105445.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5972a7d2fd---13324499611.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/b65af2d167e4ffe95c04d3559ac475ae/11288576029.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3467662054.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/jejogepufijimujimogo.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/54260433759.pdfIn PDF document text
    • http://falerisztika.hu/tmp/75625312056.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/pusomatukopifelawiriwuwaz.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/39387257736.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/d261db8ce57f9abc586875c089169510/lemediwofidezej.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ed6e409b3---jugemakomulujujisosudib.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b73fa440d9---zegaj.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/19c60377004a9fdb6cd6a2451a7781c6/ronewoxodekuvagaselokabik.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/65b45d0e5d3e7167abe2ee45478f0bfe/goxejitafulog.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202108281951347347.pdfIn PDF document text
    • https://samowar.ch/upload/file/suwepatudu.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133475fa66a8---22976954348.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb24a4c64f---wasavovapefimolomafuz.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/5528985990.pdfIn PDF document text
    • https://cape-electronics.com/media/file/41919211251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=hymnal+song+book+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_off0000d17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17A 10756 bytes
SHA-256: 730158245ad34f63b30f47ae43523b5e805e1ec77643b334ae72362f832af46e
font_01_sfnt_off0000e9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D2 17540 bytes
SHA-256: c487d0ebe40b2505426dc6b3e6269c1c2bc57a53726381ff97582d1072a0d5b1

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