Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c76c3ebd9f144b…

MALICIOUS

PDF

104.7 KB Created: 2021-09-16 20:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20dbe31654f26fba10a9994ea0e4ae85 SHA-1: dd820c7092b5276dd26047111479b07be9301801 SHA-256: f3c76c3ebd9f144bdbcf9e027aac74b9b3d6837e59edae0554aac9a64f12b529
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to lead users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/mororiri.pdf In PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/wazawimoziv.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/sadoruwutisizekalexale.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/dunebejaxa.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/7a647c9943e30de942d43af66486057e/82531758840.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/soropejubijuxisazopuso.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/welosafam.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf38d303b5---lazijuteko.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/boxiwutadofot.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/13653000283.pdfIn PDF document text
    • https://desco.scp.hr/files/takigawidorob.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/79069027398.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/gizelozawedalur.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/zalixijalugoxebu.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/kovujolere.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/39199283464.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/50a37fa5369f6bb89a5d855b33006886/53988339248.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/2876867719.pdfIn PDF document text
    • https://masukpt1.com/contents/files/lesudulinoge.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/nogiluluxilimabenida.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/welamabo.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/lonaleporekafipadipolu.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/53082781425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=transformers+revenge+of+the+fallen+free+movie+onlinePDF 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_off0001310d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310D 19656 bytes
SHA-256: d40fc16789b9d980d0f97d9d2c7fc19d29a12dd25b80ee074ce273b7ed1fc21d
font_01_sfnt_off0001649e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1649E 10688 bytes
SHA-256: a4365d8e974790fb42b1a16c4d0556bd88510baa51100a76524d66322b99101f
font_02_sfnt_off00017cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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