Malicious PDF — malware analysis report

Static analysis result for SHA-256 0509f7b26b76aeb1…

MALICIOUS

PDF

63.7 KB Created: 2021-09-23 10:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: acb3e4886f4f47daed2d733be11e617a SHA-1: e2cf761a16eaa920965ae460c6f14c43192f54d1 SHA-256: 0509f7b26b76aeb1cbcf7aaeccea7bcfd4c2da7d56012243ecbda96d033f9e89
162 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic firings indicate it functions as a link farm, likely to distribute phishing content or download further malware. ClamAV also detected it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7025

Heuristics 6

  • 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.
  • 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 https://wastran.ru/uplcv?utm_term=android+emulator+windows+10+free+download PDF link annotation
    • https://havadisname.com/upload/ckfinder/files/fepuwobikexaki.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/75582119733.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/29898923515.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/462e94e0bd949b63b8a5f34d09359906/makepejawapozavirogikow.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd2ec9ba08---xarelekagipudozu.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/23449614624.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/45570617063.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/muvupebibede.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210909/file/wibegetumik.pdfIn PDF document text
    • http://rayer.cn/d/files/worijiju.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/61376372444.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/61984717699.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/favedapelanuxexotatiribe.pdfIn PDF document text
    • http://jawarakreasi.com/file/40061097327.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/64979174726.pdfIn PDF document text
    • http://www.grifin.sk/files/veterisanowot.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/lizirulojekujosofojepuva.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/24836685002.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/98477624985.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/19503436431.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/delupapikigotesasa.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f1cab7604---76304816822.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1a768c2ba---3182028317.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/m4hha05e6k559elio4ost2k2or/31852349113.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9C 10856 bytes
SHA-256: 290e749865aa64956bdde8cf36a6ca1f9cecb2eede6a50ecdff67de69e41a8f8

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