Malicious PDF — malware analysis report

Static analysis result for SHA-256 6137b17b78cae9b2…

MALICIOUS

PDF

63.7 KB Created: 2021-07-14 03:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ae8879eed3d0d2a0971a4c031a5ccefb SHA-1: ef6dbb7e5e61054dc227e14c428df2d935c1df7b SHA-256: 6137b17b78cae9b24b6cfe5a1d2a72046bb6a7fc631aa7dbf5bf225b96c1e465
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing or malware distribution campaign. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to distributing a trojanized PDF. No scripts were extracted, but the presence of numerous external links and the high confidence score suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9617

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde45d6ab3d---52922418583.pdf In PDF document text
    • http://nessium.fr/userfiles/file/69245446876.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/3g7nanusv6hc2o8ba37ankkv7n/6168899312.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/15390199950.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/f5d4d85f75890f3a2ce2ef580c52e48c/97621566522.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/buxepamabojagod.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/19fc80295c0a202ba11a0b7298e29e92/pewulujatuxadoguxum.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/51185215735.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/wurovowolisoponunelirenin.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/jqf7asu6ai9blt3f2tv1qp65u1/wutedizojimefowa.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/rodaxaxerevafuregep.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/siwowaneximevevidaxazop.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/u3e3uhlm1tpfbfrjfdmc10bde2/56839623035.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/n48dp5110c96adcifrn7a30lg2/pepufej.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/62ec9ce1c303e4a292ba50c8b4285496/85818500687.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/41748609261.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160adf1d1d120a---muzatajekabudisamuzonoro.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa0e4c0b53---vawajevaz.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077737e971b8---35455290901.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/puluxajepividoz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087507e47a88---59892478362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=sherry+shriner+interview+with+the+devil+pdfPDF 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_off0000d16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16D 10652 bytes
SHA-256: deb2e4ebe11a7ba2482d2254ab7c5b6b3eb16cf320364a2ad9c5f1f7d8f362a5
font_01_sfnt_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1