Malicious PDF — malware analysis report

Static analysis result for SHA-256 50590a283755202b…

MALICIOUS

PDF

84.3 KB Created: 2021-09-03 01:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 343a8ba69db1c46a459bd16f7860711c SHA-1: c88bbe13e4c49ced2200ccae75e15507ce40498f SHA-256: 50590a283755202b7f00dff0da666993af1fa306d8caeef5e06e68f02a297384
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bistakalikotenetwork.com/userfiles/file/32772729303.pdf In PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/lozadizikez.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/pobewededowerumiluwenes.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/dovoriw.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/linhkp0jmta4a52p2q9vcolc2j/52933177592.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0179d3ff1---kinimekok.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/84ceeaeb1cd8b349f8e6a2dfff52b9e3/89199349833.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/98832763963.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/jmeo630v4cnol73ce37jeoq158/7853559776.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/rodarirekemaratabe.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/fajukisanovawovovefo.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/63835552435.pdfIn PDF document text
    • https://avenue102.com/uploads/file/dolifowomususotikeleveg.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/861ed8b8315e9c98c05bf4bbe222bac2/50761315208.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9654b0116---fafolitanonejeja.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/39410632217.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a73ea937b4e---juzigejuzomonolaf.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa9240850f---54631925589.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6f4f5cf84---dinawisusosokofaxirimaga.pdfIn PDF document text
    • http://balone.net/_upload/file///79577263441.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/19702617835.pdfIn PDF document text
    • https://puppometalli.eu/file/15965341975.pdfIn PDF document text
    • http://mqskin.com/luutru/files/vobanipibofunuf.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/1689411385.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/vuxiwakemebedusuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=automated+manual+transmission+explainedPDF 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_off0000e3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 10736 bytes
SHA-256: 450c05e445f708e54779c9443afcd9c1af3e24fdb792fde9e26425cb04e1a0b7
font_02_sfnt_off000114b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B8 17928 bytes
SHA-256: 05ddd21269a1daf082d0e80995d110f1c305d21c6207a35ae95b3fe177dbc8dc

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