Malicious PDF — malware analysis report

Static analysis result for SHA-256 640c2bda809d0ac2…

MALICIOUS

PDF

109.0 KB Created: 2021-09-17 01:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 97a114cc72603ab99ee5514a2aeec934 SHA-1: bc2c4bdf35962b2a5029e60a8107dd88fd439de8 SHA-256: 640c2bda809d0ac22b98384f286090df2a4f87865fc9f5eb7b8f5410dd003f91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary purpose is to host these deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=all+waves+in+the+electromagnetic+spectrum+are PDF link annotation
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/03era1c12c61fqt47vfr2pbpvn/57564355333.pdfIn PDF document text
    • http://soles2walk.cz/data/file/kavavowi.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/a00e2d83b6851afbb3fa60c3da71b9f5/92493193202.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/sesofa.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/74350641411.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/bibivagusumixotobixes.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/ritatanexipegidikesez.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/94218208945.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613370a6e2e3a---99643305515.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/pozevajejigefabezut.pdfIn PDF document text
    • http://chikatere.com/Upload/files/gurezatopita.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/jezowexigosufu.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bddee4d1e---88318904240.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/pudubo.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/31360834757.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/zabunokovesumelebabu.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/mavavovivupuligepulexupu.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143b678c3f07---29924640054.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/govogafobemafulapuveguxe.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/boxakozezaz.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/41883723352.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021090917200791.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/67811699641.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/xixavifesebatubivikofana.pdfIn PDF document text
    • 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_off00014008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14008 11056 bytes
SHA-256: f54f734d9a2de3be8f3a2968d771f3dd23bb0f78cd50c4b9707d718daedf08d5
font_01_sfnt_off000159a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159A4 20296 bytes
SHA-256: 896e334f7b7525050d903a524aae1f478deae0637724bb11c0fe99db15f6796c
font_02_sfnt_off00018e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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