Malicious PDF — malware analysis report

Static analysis result for SHA-256 692cdaebaf23300f…

MALICIOUS

PDF

75.1 KB Created: 2021-09-15 23:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1f71f3feb59dc2be50e28d8971c07dc4 SHA-1: 1fd031bbc6c3b9367eef51bcea67331c2c1f9ce1 SHA-256: 692cdaebaf23300ffd032cd4a9b192bdd892e613e68f8d1d4403b106197d2288
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or initiating malicious actions. It also features numerous external links, several of which point to compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://luberoff.com/userfiles/file/6479727475.pdf In PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/nipuwumujonitipuzep.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/fuzowax.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/suvakirazitomutipej.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/79286917715.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210904130355.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/50615230750.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/denefanaforeloj.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/wemitafipojovaw.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/rafigegevow.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/jajugunegebabufoko.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/niketusugoxat.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/80064180061.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109152247238775.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134406153d5e---37400488575.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/xavujeren.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/vabefige.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358c2337719---jorovetefopumodep.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/raririmitibekufarekosediz.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/1763324326.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bf1d8864c---44928042511.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613059229cf15---dugifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=super+mario+64+nes+texture+pack+downloadPDF 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_off0000bf4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4D 11376 bytes
SHA-256: d9fb7b7d9071bcf9f37828ecf4db3aba0320316a0144255616ef9d5bd4cae518
font_01_sfnt_off0000da33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 17128 bytes
SHA-256: 3f15461eda10feadbd1e7aa9b2b23b98ccd974d481370f80b7b62992c15da1c5

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