Malicious PDF — malware analysis report

Static analysis result for SHA-256 7073d4432b58341e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 13:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7ab7d0aebe286a73a72be6c365c87a6c SHA-1: bad08a560fe1d7b5c28f7f2df94b4fa6cdf26584 SHA-256: 7073d4432b58341e66a84420fe969ac857a6aaeb9726c250e3da7677b447ec96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://dom4m.com/userfiles/files/28000855481.pdf In PDF document text
    • http://lakesnwoodskerala.com/uploads/file/refoludoparonuvumusefim.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ef41b7fd511f3a02092adcb917320686/toboxokosafovonus.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/18318134290.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/d15ec6a2bbdd375e5d4a7216d6c4219e/88156699157.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/94784038078.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/nufavevujuparixopovejusog.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/43240256741.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/61618548333.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/14045936268.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210909231202.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/23635854836.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/6122458134.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/pavumutorelafeditum.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/62052038724.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/40361752396.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/pugidurevilem.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/36969882016.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161377fa2f1c66---mafijimapa.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/43547901916.pdfIn PDF document text
    • http://kotolantopeni.cz/file/juvovimevitifemajevom.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/xutugarulidufujelono.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/xijafibofegejumuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=family+locator+pro+apkPDF 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_off0000d90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF120 18028 bytes
SHA-256: 79d1c816f40ee91aca926b0314386cbd28d6a6aea6548f1ed0639dd676b9bb4f
font_02_sfnt_off00011f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F57 10316 bytes
SHA-256: 5f62c0c7f24ca0891f19d49f8f00c1009e9626b6590ec54719bac1f86c0f58b6

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