Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1d586f597394c6…

MALICIOUS

PDF

88.2 KB Created: 2021-09-12 00:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8446e985d40bac9ed9bf648a7a3f02b1 SHA-1: 37d77476d1cd9d83d74ea69f3c3aa4f65aaf7cab SHA-256: 2a1d586f597394c68e4d96e5b6893e910ddb1373e7b56c11c96673c1018a1ef3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, specifically related to phishing. The presence of multiple PDF link farm heuristics further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/i7l5b1v88mka9u7pfea4b85k16/pemejidifawulov.pdf In PDF document text
    • http://abwlargo.com/uploads/files/34552367405.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/85565814092.pdfIn PDF document text
    • http://samtle.net/ckupload/files/muvivelipepixuxawazadedon.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/11957489987.pdfIn PDF document text
    • https://domilot.com/uploader/files/ginabibagozisurelalurubax.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1b15865bb---wogoje.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/misiwofa.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/bafudowe.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/78449073377.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/93476050374.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/36762909767.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/76166874680.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d08b604b---purizagixipuduwobavuwada.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ae76b7b36---renileloz.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/95306522457.pdfIn PDF document text
    • https://best-label.com/upload/files/89540714225.pdfIn PDF document text
    • https://ottopianos.nl/files/13551967535.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/66087786353.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/dipedenoso.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/65592684453.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210911195609.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d1d97ea8---47527169991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+unlock+sim+slot+on+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_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC5 10668 bytes
SHA-256: 1521711e8a970e93b269a65f9d39862bf62f26704676a31d025c755bc26e6cf4
font_02_sfnt_off0001242f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242F 18128 bytes
SHA-256: bee0428d2040c5e69e23e9d6f28a72afc46a5aec59ecdafcd82f14d4f5717696