Malicious PDF — malware analysis report

Static analysis result for SHA-256 659bc70a5fd2e226…

MALICIOUS

PDF

60.5 KB Created: 2021-10-01 05:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d9f679d34570a315f8be0120c6e17444 SHA-1: bdfd6bb04878aaea781644ecdd4378333c70887b SHA-256: 659bc70a5fd2e2267c3313c493e127ae45e08721c5a73185bd4485a8c98a0285
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, directing users to multiple disposable domains and compromised WordPress upload storage. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4569

Heuristics 5

  • 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
  • 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://medvor.ru/uplcv?utm_term=family+guy+yanket+gif PDF link annotation
    • https://www.adoz.cz/ckfinder/userfiles/files/62773823639.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba4bcac9c0---58806866752.pdfIn PDF document text
    • http://domario.ru/userfiles/file/20309035444.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/61464270474.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/99931375863.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/xujuzaxanejogubemeni.pdfIn PDF document text
    • http://nprofit.hk/userfiles/xapuvu.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6c56e050a---wenasiligisalaguzemawuse.pdfIn PDF document text
    • https://gangnampools.com/contents/files/muzanexopitusalo.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/xiteselotuwozoxa.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/texikusibasejaboki.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/juverobogadixe.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/76141894027.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b79f6a92a4---88117896349.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/fujabek.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210906220403_x9e291.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/segixed.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210910083713.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/79836907486.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/levepotevimodugusaf.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/mebuxo.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1d3907232---bigojuxugigikiveni.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/banojoxisog.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/81292654009.pdfIn PDF document text
    • https://coluer.ir/documents/file/85397512290.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/88653639763.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12E 16068 bytes
SHA-256: 38bb964ec8fc7ef1beb14bac4c159b0b61ef7bb561d1e377668f6564aceeb0f2
font_01_sfnt_off0000d969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD969 10452 bytes
SHA-256: 1426306d7a60c63afaef699fb5b8ba7792bc59207ea2ee4ff7eeae6879cbd671

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