Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d9f2e8b022fd3a…

MALICIOUS

PDF

84.7 KB Created: 2021-09-20 02:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1f4af9514121087f3a69811028e24cb7 SHA-1: 82e66f110b668b82b08be9ea690a81a0f5b51ac4 SHA-256: f7d9f2e8b022fd3a03ef055f841ac20c0fea1e308cdb62d01ba23ffaea2a1d9d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common method to bypass security filters. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is part of a chain designed to deliver a secondary payload, potentially via JavaScript execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://avtrak.ru/ckfinder/userfiles/files/gekofi.pdf In PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/xotox.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/48609623795.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326e84cf354---93969193698.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/70183542498.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/muxuxevi.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/88154714592.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/1056105349.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3e13a0c0f---dukirudosutubap.pdfIn PDF document text
    • https://full-e.com/app/webroot/userfiles/files/20210916_060338.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/kevibepupaniguxolagogexiw.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/8abe40bbcb1e5ed243490b47355d1ded/3810521197.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/67719628721.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/ludemifegat.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/dupowalavegixukalagas.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c38247897---37031009512.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/50578243326.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/20271309624.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/tapobobuwesofiviwil.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/65197501616.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/28521773637.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/fitapufuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=como+deletar+icones+do+androidPDF 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_off0000e233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE233 19688 bytes
SHA-256: 4863c831ca0e92a88354bb5d81b03e5f560cdbb65e6d7c7db207b37923464678
font_01_sfnt_off00011359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11359 10560 bytes
SHA-256: 2bd415b0f40081234ad2e1269f87f00afd6945b8f366a44c4a493a3ad019cb27
font_02_sfnt_off00012b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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