Malicious PDF — malware analysis report

Static analysis result for SHA-256 85fc776f73175a23…

MALICIOUS

PDF

88.8 KB Created: 2021-09-19 06:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 748e6b804baefcf9fc6520b04bde1c53 SHA-1: 313d17a106baeb166f202dcf4af3b6b1a9bd09d5 SHA-256: 85fc776f73175a234aa6617d925a43f18907834e402c8f3c8aed80cd47a1dcb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were directly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • 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 http://vwtint.com/userData/board/file/bekokibewuderatefotex.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f78da38721---dekabebixaxipibodijida.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/xagazidimu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/ninepobopetokiralele.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/dewipixozisebizezam.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/komosuruloja.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/momugipi.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/29142205123.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/6204661152.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/56699070933.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/80684241859.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/87944944879.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/juzufurutodozaxan.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142bd34e5a17---41698708207.pdfIn PDF document text
    • http://tykhchem.com/upload/files/44200070614.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/xexikenatazilexofaxaje.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/zugezaxatiwulibowifufore.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145f04de99d6---50075634096.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/5786563226.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/87246456094.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/wazopozawobefesekimor.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/75431989474.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/17911390897.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/wasefezevavol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=backup+from+android+to+iphonePDF 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_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 10916 bytes
SHA-256: 6739835a477fe60314ff65be7089920b47b059ac1b38411586b7ec385189b8a7
font_01_sfnt_off000110bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BD 17400 bytes
SHA-256: afcf448ff2de1aa01b1bb33061fdf1af65cbf80c62581f705492977e7c950667
font_02_sfnt_off00013d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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