Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffbe8df1d5cc6c1…

MALICIOUS

PDF

75.3 KB Created: 2021-09-07 06:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d2f88ced4424e6c151269f41c637016 SHA-1: 512b88a1705b2aadae0afdf84873de86bc9df1ab SHA-256: dffbe8df1d5cc6c11832eac3d7f9f463232a1ab402a16fc28e8af5f9818bb216
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation to distribute malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oresteruggiero.com/userfiles/files/zisiwubowevaxas.pdf In PDF document text
    • http://insei.eu/userfiles/files/fomusupibilasowun.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/875d4890e87f382a8e374b3cc9bd4344/satefidukojipuxan.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/q9rbv2n3l7bbd9p4ketu54oig5/13485581711.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/62213346202.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/tvj867em5img6q1ju1n3e5deg5/84511876516.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/wexexavabovuxurojaziso.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/walefijojodegedanud.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/161276251e45a9---83316283913.pdfIn PDF document text
    • http://fedoro.ru/upload/file/lojokudavo.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/sopowafa.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/90102919474.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/kopafuletidineg.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/1836165104.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/be8feb6feb30143f0d3341282532a145/ropesuxojuraremujarulekez.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/fae8314bebede370fd5a42c47919286d/76615845828.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/36231599740.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/72288436678.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/datukofu.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/78149284871.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/vuzilibudofejazalar.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/45951011995.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/zopiziripupejifatufazo.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/patudifebas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=mitosis+flip+book+pdf+answer+keyPDF 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_off0000c0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EF 17764 bytes
SHA-256: 53525ae7cccdfad43befce13ed0c1343312c7c20fad586a1240d099261fdd1cc
font_01_sfnt_off0000ee0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 10916 bytes
SHA-256: c98285ab655670d6ceb7d0ff732002c5c237238ee3c3a1727fae4f261e2a98e9
font_02_sfnt_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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