Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8be733391b7afd…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 10:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e436a5f969cbee1aea2146d4d0a72648 SHA-1: c92cd7530131241609490ec27406e1f2396a4ede SHA-256: 7c8be733391b7afd45afed8b589b59f8dfd57c659adc0607702d715f6ef8ed4e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://laborke.ru/uplcv?utm_term=i+am+at+your+disposal+synonym PDF link annotation
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5e55da8d1---10123540329.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/popujomabuwepo.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/34284700299.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/vinesodosaxavakoxe.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/13690982224.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144951c129ee---37829670700.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b0315b2c5---nukiwisolu.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/9025248131.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/lonebumerapogixo.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/bidozamekotejibolurivoga.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/84883288251.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/79717424422.pdfIn PDF document text
    • https://wonkingchina.com/d/files/22746883461.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/82748229107.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/paremoboz.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109162333303558.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132953b6c1b5---93276034359.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/daduragabik.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbf0a940b9---dupiwoviravutefidojafaseg.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/72677967090.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/lawoval.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/lupozetupekezokizevebotoj.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e8a774428---midado.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/29223684372.pdfIn PDF document text
    • 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_off0000db3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3B 17700 bytes
SHA-256: 60e790af6d6c74a7add701ff9edeb2ab83ca7ed74ffdfd623899756ee8504347
font_01_sfnt_off00010920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10920 10588 bytes
SHA-256: f46dc5e30b09b234e5e0c635f79356acbfa8750462b6562943fb7c323c2c2105
font_02_sfnt_off00012144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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