Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a4673c644d1198…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 03:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f3589267b013ab06eb74c37a76517877 SHA-1: 44e3c3ae331bdd3e6e5ff3092f6eed6f9ea76d03 SHA-256: 97a4673c644d1198b36d816b59992d69237249655355a3977fbc70c9544f201b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript and the presence of a link farm pointing to compromised CMS uploads and disposable hosting suggest an attempt to lure users to external sites. The primary attack pattern appears to be a phishing lure, likely delivered as an attachment, which then redirects users through a series of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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
  • 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://marathonlaval.com/userfiles/files/nefixoselofowaroraxovirud.pdf In PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/korufodelajiruvopitafudo.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/tixojakesopegutat.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/zegefojagokunapexi.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/xakepawumatem.pdfIn PDF document text
    • http://heizler.hu/files/file/21270516979.pdfIn PDF document text
    • http://tradotel-riviera.com/file/dewegofoso.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/s5m4584l3hfb2rcdu57cd2g0s5/73457765191.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/kimexabokoju.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/12971939100.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/55050148697.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/sepukiwefuz.pdfIn PDF document text
    • http://portableandcool.com/files/files/49339568286.pdfIn PDF document text
    • http://vning.net/filespath/files/20210909190728.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614356bfe80a6---tetuwivuluzuvofukaxewo.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/durakutolisixulibagak.pdfIn PDF document text
    • http://fikszo-whc.com/userfiles/files/96619532356.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210915233710.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/84566130794.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/puwatusepulajovalixu.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/22141179053.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613e808aa4ec5---75820955542.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/41450550462.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/gasimeva.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/42044272025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=bombitup+mod+apk+unlimited+smsPDF 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_off0000d166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD166 10836 bytes
SHA-256: f9542a58ef20b9fa511c3956fcd3b0500b07e23e4d6a6f4b75a83bd0d59ed001
font_01_sfnt_off0000ea38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA38 17672 bytes
SHA-256: 69194e7558302974de488ea3d1e6c6c12e2dadc60a4a0e8b9ea7f313d7d1c765
font_02_sfnt_off000117da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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