Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd588a32af42b1b…

MALICIOUS

PDF

74.1 KB Created: 2021-09-19 23:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 41ab7f6fa3e03643254bd3d9aa569d67 SHA-1: 15946cf1d711a1f61eb20a7aa753ea8ce4b10d37 SHA-256: 6cd588a32af42b1b7548f0a70ff9290c59228fe5d3f2263c68893f3b35af579c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The numerous external links, many pointing to PDF files hosted on potentially compromised or disposable domains, suggest a phishing or malware distribution attempt. The presence of a link farm on compromised WordPress upload storage further supports this.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://wineart.online/userfiles/file/15523076620.pdf In PDF document text
    • http://ergakiland.ru/files/files/vezorojili.pdfIn PDF document text
    • https://techlan.pl/files/file/bubepogisu.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/fitijowubovarefulofux.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/17663250676.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/65851587345.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/19012184231.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd0a96ec24---25748382476.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338eedbcdf5---zaretiwawod.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/70657dff1dfd2bc72040c39ddc9e45c0/96382958385.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142239133d71---31752576900.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/43755174064.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/2099402657613d28f484646.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210913_195900.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/84602528730.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210912114242.pdfIn PDF document text
    • http://balalajka.nu/media/zegutigizitugejudelopo.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/7762665580.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/dinozolijetobigi.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/gaxid.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/53072599552.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/rokewix.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/tetirugafiluketana.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/pupuxesedotefafodev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=where+can+i+stream+how+to+train+your+dragon+2PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD365 11184 bytes
SHA-256: 7f4638b235facee07b73c7267b89f4e6ed448c689ec24b425cd42da2a528f74f
font_02_sfnt_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 17312 bytes
SHA-256: 9c4689254d1c9c65cf93f93d05944fc9120f80f7695acd0e4e936c4f82526989

Open this report in the interactive analyzer, or submit your own file for analysis.