Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7a66eb38ff7a4f…

MALICIOUS

PDF

73.1 KB Created: 2021-09-26 01:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c198707d0868d705b5f3d19071ea2ecd SHA-1: ab387bc9ccd97d7786d97f78993c3115505f25f0 SHA-256: 9f7a66eb38ff7a4fe0e241a11cdd58548d6b3c425b0092dff41ddfdac40011cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://wastran.ru/uplcv?utm_term=webview+local+storage PDF link annotation
    • http://coolscape.info/images/files/13479195342.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16133965921783---posanogewovezad.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/filagifikabug.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/20163149589.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/39834019285.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/80341400348.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/59653200583.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecd48eb6e8---19724581076.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/99962313768.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/87231459351.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/vojutabazodopesefogaj.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109190715586537.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16146b54e7248a---dimivu.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/disoda.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/25925185397.pdfIn PDF document text
    • http://boxethai38.com/upload/file/pijulemikodinujaxiremo.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c7d2206bd---bedasaxumukedet.pdfIn PDF document text
    • http://only-svet.ru/upload/files/sedakitozevu.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/fusugutedolinetawot.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/55482884788.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/91082951596.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/jasusidiviwivakajiduxu.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/doworo.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/38910025399.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/62351850558.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210921_A45B9EB495A009BB.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_off0000b701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB701 18068 bytes
SHA-256: bd847144ce4b5c309c1278d734b5b3f880c1bd975b5b5f391b509a809c60a840
font_01_sfnt_off0000e617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2E 10588 bytes
SHA-256: 4efdec325fe7f17f7e058c207a27858800b4a6c4619f8f87e7837f1288905161

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