Malicious PDF — malware analysis report

Static analysis result for SHA-256 563c9f17eaad97a8…

MALICIOUS

PDF

82.6 KB Created: 2021-09-14 05:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cffd5324d8333725181cd2eb3a755df6 SHA-1: 1946488029989871719d7960cf82fc1a961671a3 SHA-256: 563c9f17eaad97a811d4fe14486708ff13e8ca905ed80adbe1c0e56b688413d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=my+time+at+portia PDF link annotation
    • https://dreamscapes.ca/dream_scapes/userfiles/files/74875031382.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/juviwajemiliminopuwopuv.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/47935996413.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/91475756934.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/zokebepaj.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/93830555011.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a218d47653---totukuredomomigibikipava.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/95534928748.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/damapazuvufurixixar.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/30650558977.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/zuxikixejutalodabokuku.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/60432114695.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/67371078021.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/guwoko.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/zirurenorofogilo.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/volezimujupoworabowur.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161385e9d3eec5---sapedomul.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/2985558af78fa7d5aad9790382775f3b/waxivelusi.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/firesazowizinelusesupoli.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/tugaxolikukol.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/butelopubezon.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/meraxasevidoxoge.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/53713464448.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/1974503988.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/90798616312.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_off0000dee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 17768 bytes
SHA-256: 684594125043b89bc9ee31795f0b8de55db6748bb09157ec149ad96d5eaa61e3
font_01_sfnt_off00010d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12591 10204 bytes
SHA-256: cc4930c541a7066bf434c1bafc4dbda260427fff68214f9fe0f46a721ba7182d

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