Malicious PDF — malware analysis report

Static analysis result for SHA-256 c366c5e00425e3ff…

MALICIOUS

PDF

86.0 KB Created: 2021-07-21 21:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 36c53997fe2c9d92b6874d5d4935e7fa SHA-1: e83841170c853669feef9343a4e4fd94f026cdc5 SHA-256: c366c5e00425e3ffcaa5a459cf5153c1605457aad1c0bfa57143f1c7ceed4b59
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely involving redirection to phishing sites or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8127

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.knickmeier.net/images/pageimg/file/52913952420.pdf In PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cf6e96836---79488911775.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/12734419784.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/e9838a6c9ba18e22788868b3bca3c4d9/nakogowitamipefimaxil.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/43021907220.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/vavapajajafizejovijo.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989af70490a---86768758600.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/37e8714abd7c3fb571ea6a8f1aa6e8fb/19068635041.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160719fa52da41---23706619634.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/hl22mjlv5l6t46f602naea3cf3/90982742664.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/bupabufezeviwivu.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/putakasoxuvewupivojifuxem.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/sodepikebo.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f222c4dd4e---20125301842.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/pajisefimejuwopowafufule.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20215131826523598.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2156e8893f60bdea6dcb431cf6639ca7/18507308687.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/h3ashtun4m3iikkei1flu2jsp3/75391683150.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-7-8/20210708131010185307.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/dagoxujigegak.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/buloxawevavi.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/dimujelililuvuv.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609830a993c78---35437804409.pdfIn PDF document text
    • http://abnicum.com/files/file/91991050837.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f42409f44d---51604597755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=exercise+32+anatomy+of+blood+vessels+answersPDF 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_off00011a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001322e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322E 17336 bytes
SHA-256: cdb2b16faffbc32a2cc4bc081bcbbf149851e5382b0f66b6500101bed8146013