Malicious PDF — malware analysis report

Static analysis result for SHA-256 637eacf5e8e2830e…

MALICIOUS

PDF

151.8 KB Created: 2021-07-31 15:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a0044047eb0602616ea9dee7456a9a3f SHA-1: 3d21b3cbfdfd8e745f009470ce60ac388523d535 SHA-256: 637eacf5e8e2830e3db5cd5f6b50990157485cb5248ecd88255fcc7819dfc232
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, which are likely hosting malicious content or further stages of an attack. The PDF itself appears to be a link farm designed to redirect users to these compromised hosts, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dec5f0b434---30645748389.pdf In PDF document text
    • https://baxsporthorses.com/userfiles/file/lesufoxaxujemu.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/gunegiju.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/kebewowijalati.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/9h9g36fqs9pdsuntmo04di79aq/10545028357.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec7b7565eb---79036811516.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8f0852d92---pipogol.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/vujobokuwivor.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b857def18fd---natuvozafeb.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/28647632742.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gisqp2le0q6i35l39s6clmarm2/83960099041.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/gazegawozol.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a3be1e20---mapuxiwonalurexoserudodo.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ffcc3753035---41968168663.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608929b5ca842---37924087417.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/rikosepudevumubinav.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/xofevekon.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/c0515fcf310bc86188dbfb31b131d30a/95564630023.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/zevizupebapi.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/bunepipejawedizadugezo.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1ecc3c5dc---libanepajokazirepero.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d86732e67c---fafizuxizopazajenawugatud.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c08b2f8db2b---bezarusuroxononinipor.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/zaguxubujimixovabowunem.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a23e963ee82---20679993586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=balanza+electronica+uso+en+el+laboratorioPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00020145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20145 18464 bytes
SHA-256: fd2408805f27193e17eabb2f92e6cbf0ab49f87218fd9160eddd4e9732f7349c
font_02_sfnt_off00023012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23012 10576 bytes
SHA-256: d5ea6f8d6087f258e27f7ac5a8acb8af023e9a06ec4c3dc09f724a1a876def9f
font_03_sfnt_off00024865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24865 1636 bytes
SHA-256: e3a1ca7fbcde87b6e2bc585668cff1a50452d2a09c95c546c16e9f90aebd6500

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