Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b75ebd20ac613d…

MALICIOUS

PDF

62.3 KB Created: 2021-09-20 02:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2bc54b897bce64ca929b9c29b5154701 SHA-1: 4d3a1100c68e6eee419b943f1ee49d8099d80941 SHA-256: d7b75ebd20ac613d7db923a994706fe82047d76740204239af2eaa1afe889058
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The embedded JavaScript likely serves to further the malicious intent, possibly by initiating downloads or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5680

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://artospace.com/pics/file/76044584129.pdf In PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1612f56c47bcf5---fogujewuzugowubidis.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/95442364586.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/69725226030.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021920_61433_626.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/89638932093.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/vulibu.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/rakorawapakeso.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/joputimavumofugusinigopo.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/35850792957.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/matipenemevagili.pdfIn PDF document text
    • http://na3.it/misc/file/41621432686.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/boxolifivenafix.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/lufedodetideguxedetun.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091600255119.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/rijamadikatikivilim.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/lovaziramakefud.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/magavegaji.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/21vka78o38uoq0ua78869t59ot/22973996932.pdfIn PDF document text
    • http://kotolantopeni.cz/file/xidiwerekimav.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/e2kvfbl61g0s1m9v47n5locd26/kuxapeteruw.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161320e379791e---vikuxoroxawebiwe.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210910195541.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5074c10d4---38387502377.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/feladuparijuto.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/pebawigitadamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+transfer+backup+from+iphone+to+androidPDF link annotation
    • 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_off0000d744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD744 11248 bytes
SHA-256: 647f43fac4e3b124cb370ba7c443640657661b99b4b04f68234ff1ade3a9418a

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