Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f22e4cca4e1d8d2…

MALICIOUS

PDF

51.6 KB Created: 2021-06-25 00:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0b4178d41b2ce5f0bb758fba47e10b51 SHA-1: c65cf6dbc207d91ae26ee3fd3591cdb1cbe1dd50 SHA-256: 5f22e4cca4e1d8d2a848d0a83636eab4bc32a1a9b9ae06aab4ba6e04ee40811d
154 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS upload directories. The document body contains garbled text, suggesting it is not intended for direct user consumption but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7590

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://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815e1e90cd0---54520679771.pdf In PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/fuv5afgkepfpe2emt91thenhnm/74943315533.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160788fbe3f900---73306630640.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210526_180956.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/30953997276.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/v28pf5c6rogtnnsnuclphv4sct/81278268088.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdef0b9d781---67933229239.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/vemuxexifowozamuviko.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc9e7f725---11697154669.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dfdu3gl12uaqcehvo50j6cdof1/pakumorotevoxuderij.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/6015faaa068420581fd06b518c997357/mufuzuzamimizevimamol.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/gugana.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/nptpukcn3r1f2dar26eftk0ke1/6673879064.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ebnakag51chs9djlmo635sq1n4/fokotilifakeruvoxuvajemob.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b09cc0b4c03---wuwezibigaxivunevawit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=3.3+5+elemental+shaman+pve+buildPDF link annotation

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