Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5242d250802e8e…

MALICIOUS

PDF

106.4 KB Created: 2021-06-23 04:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1e2aadd754a8bba7b95c7b1ba027e3bd SHA-1: 5c07e9bbd3c5537ac211b0a2145a7b899e61f521 SHA-256: 4d5242d250802e8e2faf8a90d89c8ef21f5816895bca7b68de8333615f932aca
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8662

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://catamma.ru/uplcv?utm_term=heat+and+mass+transfer+cengel+4th+edition PDF link annotation
    • http://sochistandart.com/ckfinder/userfiles/files/sezuwuvumexu.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/64617347333.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/putige.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4bdb4bc66---lukogixaja.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b722c67db9b---35071250955.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/lutiviwawiwusomojizamad.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5f5d8687e---6273224994.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/78445156435.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606cefda7aea8---73492032754.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160891a845c21d---85826414784.pdfIn PDF document text
    • https://stopserv.ru/files/file/vifuzumim.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f1fdd226578b14a9dbfff40b9c98a6fc/buxuwodubefogifubevo.pdfIn PDF document text
    • https://soechi.net/userfiles/file/kutosuposanujegab.pdfIn PDF document text
    • https://argumentua.com/i/file/sazowebokekinixugoromoj.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1181e974---24483776948.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001582c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1582C 5484 bytes
SHA-256: f2cb2b57ade0f61d5001621e07b9b41416f9254a8359ab25eac67db9bb32c4c0
font_01_sfnt_off00016a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A6D 6168 bytes
SHA-256: 9857c94a8075f63bd19945fab8d021764579c4fd6569a81599841c1724c18950
font_02_sfnt_off00017954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17954 13748 bytes
SHA-256: 90358837df5bda71e037fa8f4c84ed413d9a6db7e5f92c544805586d65835b08

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