Malicious PDF — malware analysis report

Static analysis result for SHA-256 40cf5f2525fcb3a2…

MALICIOUS

PDF

78.9 KB Created: 2021-09-02 05:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 96c47958e4f400568605b7e2de7ae377 SHA-1: 7bb63a04ef4c72627d551c2e4d86ddc5107c46f8 SHA-256: 40cf5f2525fcb3a279f1e20fbae222c5b08205247b4b3d13f1e8c183ee072e06
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6194

Heuristics 5

  • 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
  • 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://synerhu.ru/uplcv?utm_term=ac+market+for+pc+windows+10 PDF link annotation
    • http://takemehometomatoes.com/ckfinder/userfiles/files/zupozemovikixazeduvi.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/43513453814.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/lukurapunesuxu.pdfIn PDF document text
    • http://chipgene.com/image/files/20210719_075351.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/f4c141cae07dcf5fc7a822ddd6575231/turere.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fc4d69780e9---49585277929.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/bd494871b17c6cbb432b0a69565d0499/jegavuvu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb9345beb8---varigobekewutoju.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b72af93559---nalelepetigagorum.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/62701547669.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/kilanozolosuwobolig.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610b15c0e6505---sowimosawa.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/48865951325.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc47302544894dcf301f7ccfc238f524/92905621039.pdfIn PDF document text
    • http://xsteelstock.com/d/files/11663273293.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t37t5ppd0f7i7b4fhtv498ikl1/buwemiremigoge.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611488f12f679---kapovipufonewivejuk.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c86d6a9f8---24537049300.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/vibeluxadukogaxokazibajir.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093c65c7872b---80737224678.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/rejujisutalegadejetakis.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/14786226195.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607555bca6942---78415417173.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0C 19256 bytes
SHA-256: b6a429db498b68fd322edde6fe2115abdbf64ccb097e8bdbb0d2ab9a924ba715

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