Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f06b555f727196…

MALICIOUS

PDF

86.7 KB Created: 2021-09-05 12:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b6805a82d1a8ed07393d493a077726cf SHA-1: 28feb6faeb1a8f9726628d123714b51bcc5cfb88 SHA-256: 64f06b555f727196301e8fc5821ff79e58bd3b6d816a5444964a8b3d19526e0f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple links to external URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and external links suggest an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://codecs.ro/images/file/97085703182.pdf In PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/93129747577.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/5hcafdar784qa29ijmnb698j54/63717594873.pdfIn PDF document text
    • https://austarpharma.com/upload/files/37055235079.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/gebososo.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/jifefexavulodevaba.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/5f6745f79e2ff1b79542bacbfa75ca2f/vugokosagaxikivubur.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160757b4781e66---37289990133.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/98673590393.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/jfepm4ru6ljg7tf99uu0jvd1i4/sakoxe.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wisajewalasogig.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160f01be07206f---xujiduz.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/sutifanejezokijugugofo.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/talamijofedulaxasokexemov.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/79682842582.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/javonu.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/bvjgkoep13puiaeocn6p378mf8/56087844353.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/vugenotege.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/fanudojerixevozu.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ffe31cecd---tevizebe.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47002773389.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/42391853359.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/48c2966a353595809860dc976f30d1c2/554626743.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccb6aa65c3---58520595008.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/7b9859fce9d289b88dad581d57ac170b/pexebuje.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b49dbbcd28dde0ee24cd99d224b7e4de/58579349172.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/wofidoneran.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/lenokoganijakafolum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=donner+party+pbs+video+worksheetPDF 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_off0000eb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 18252 bytes
SHA-256: a7e8cbe722046c409a46bfe418033958e2e0786eb680d52994a43e1d755ec790
font_02_sfnt_off00013292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13292 10940 bytes
SHA-256: fc82edb45071dfa08163ff4d9f1d6997de54506dc231c63cd8385933c1c8410a

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