Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4c29b4361130b4…

MALICIOUS

PDF

72.1 KB Created: 2021-06-11 05:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 695df92623131594377122d20ab013a5 SHA-1: 66d8ef7d8f2c72bb008743a6559b26f831f66fe9 SHA-256: df4c29b4361130b410bc3ce5626ab9310d0ad92e4d2422e5c167a9f1fad326f7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, presenting numerous URLs that likely lead to further malicious content or phishing pages, disguised as search results for software. The presence of multiple compromised CMS upload links and disposable hosting indicates a deliberate effort to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7740

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=hill+climb+racing+mod+apk+unlimited+fuel+and+money+and+gems PDF link annotation
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/b19656ac881eeeb7286d5703a9e17a98/99535399041.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/cd44edf008a4808953561abedb3572f3/lonenoruderibelofe.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/99609232584.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a5efddd20---laxosuwo.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701f08733fa---ganejulakaxon.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a15ae1ae3---49125112695.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/mopufu.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/s97d27oo0huf416aj9kilv27ps/mukopipakimozefebik.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be5bcb066db---36122048442.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/31f01d82554289ceef27deec6e0120d9/58147573723.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/b037e521139ebf061b484ba8326bed1e/vojasofineguwefexovog.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/41d8e2baa670ecd40c91e39ef9a904b4/puzaxekenimurikemifa.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/3d2a04cd6f80428bf6f55e5dc1397a87/97349738826.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3704ba0940---fonapajinani.pdfIn PDF document text
    • http://hasyo.net/files/file/wijibibirarewosir.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b837325bbc2fc268ec86054d264d7e30/35849897895.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 5740 bytes
SHA-256: 39f756ac4d2bdd39353f49ed546465cf5bde7ef26da6ab36b6d02085cab71db1
font_01_sfnt_off0000fd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8B 2984 bytes
SHA-256: 2a0a4ef844ede7a3601e68887821ba5eb1a636ecc580561302efc29c9d2235f9

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