Malicious PDF — malware analysis report

Static analysis result for SHA-256 4141779af72fbf11…

MALICIOUS

PDF

92.9 KB Created: 2021-07-25 12:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 996294ede2c7352be0b1c3e85217baa6 SHA-1: b616bf8f090bf7c21bc3ac83e1409a9483c15b83 SHA-256: 4141779af72fbf11d7fa553c47e406c0e4638a96c0b62a75fb3dda11066b213a
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4926

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://awlights.com/wp-content/plugins/super-forms/uploads/php/files/bb9421ba951c11ef2dfd6e60f0a8b565/98949595838.pdf In PDF document text
    • http://work4shop.cz/userfiles/file/salejanabodofukisiwoj.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/57hi4i88e6f2311cak0etlksa2/65032158319.pdfIn PDF document text
    • http://calzaturificiocatia.it/userfiles/files/58737188750.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160abf48ec999c---bawedajedegewopugifo.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b46f026b---41401651141.pdfIn PDF document text
    • http://web68s.com/upload/files/90901481608.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607103b41b624---bawiw.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeba307fc1---wajide.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef5c1e8fcc---tufudej.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/ls1he788tuffpgmn28kek1d8dg/22876618902.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qt18bjo9qlufehlqjsesc5alq2/75038769519.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b839bb43c54---73161906400.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/xalewejegoxudapiwagut.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dad29c2742---minamekatajopodipapa.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/93138408468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=iso+5725+pdf+downloadPDF link annotation
    • 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_off00012784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12784 10408 bytes
SHA-256: da941bdd404ed5a009a3e9895cc3564dc4d660ccacec210d2828271b6c96fabf
font_01_sfnt_off00013f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5E 17600 bytes
SHA-256: d1104c7d1a4d02ce17583b0649958c37b10fe9f50acc93d0963d03d543521b24

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