Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f383eb58d4fbf65…

MALICIOUS

PDF

48.0 KB Created: 2021-09-03 19:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fba146410fc8318193190c1ede244dfb SHA-1: f1536be524bd6a9e43d68af554d0b8d46f6f6487 SHA-256: 8f383eb58d4fbf65b5f74d9c078c14176a0dc7229a8f402b41defab26c97333b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS uploads and disposable domains. These links are likely used to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8568

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://khonggiansachhanoi.vn/uploads/files/peruke.pdf In PDF document text
    • http://aescantabria.es/upload/fckeditor/file///43767018181.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160db9c99d4564---fafajuk.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/27544019221.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/k400f5u12003a8jp6au67n2f66/24434289935.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/96506785570.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f808ba1506---74884888822.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/ff3fc97cbd381d6826fe7df54f94815c/xusaxomisebuvifedu.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/sotegifaf.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f81379fb42---36381198825.pdfIn PDF document text
    • http://gibisch.org/files/files/xinugetogiz.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/85583978801.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/tuwezemamobol.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/tirox.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021060802534614.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/kudosupale.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/b7f39c9a27493550ce84de207038878f/51959515477.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/76odlakirchgsh20rusohdulu5/54034663824.pdfIn PDF document text
    • http://classtool.info/upload/files/rolidaluduko.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/64243e451f51a571d72510d2e9ed19a4/71972137127.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/br8j0hbn0aispkr4bof48pe2im/61509915985.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/fddbad08b05a04c6653540a34fa8602d/remegowenuwis.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb0305b891---pimokebijogef.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/29784870802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=air+pollution+ebook+pdfPDF link annotation

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