Malicious PDF — malware analysis report

Static analysis result for SHA-256 a792a949c3708a80…

MALICIOUS

PDF

74.5 KB Created: 2021-09-14 09:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b7974117de7fcc88bd6062d913da4883 SHA-1: f820c8e528c5643dfb0fd8aa8561ea2f56254a01 SHA-256: a792a949c3708a8055a0c1e2f883d694c09734052ba924d02a09218c8c05f464
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also features a link farm pointing to numerous external URLs, some of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute phishing content or malware. The presence of embedded JavaScript and the link farm strongly indicate an attack pattern aimed at redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://vln.nl/files/file/56075864206.pdf In PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/10797264127.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613301f60d2f4---gevariseroxedemenikomuwa.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/96738896218.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/niwojegazigib.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/82299154573.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/beferubumixepuxuni.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/xodaxagupufiwu.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/rexaxevowipomegozevap.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613759161af83---63238814683.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/88398922734.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/6271025410.pdfIn PDF document text
    • http://plise.org/userfiles/file/32367458367.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/16950972030.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/orenixibotopiserabanepum.pdfIn PDF document text
    • http://mlead.net/images/e/file/fujakuvenonizomuni.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca972486b0---xiwodudujodagezoxedunawik.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/kipado.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/kufega.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/40721561500.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/tinikibamoderixavev.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/lolufiniwajoti.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/93465191720.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/71067658782.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/43759854623.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/fusejedokovule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+do+you+get+v+bucks+on+save+the+worldPDF 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_off0000bd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD63 17604 bytes
SHA-256: ae48d7258d207b3de5dcc88281dc5fb0b452ec727d91a82f928deddcd2b76237
font_01_sfnt_off0000ea36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA36 11144 bytes
SHA-256: 26fd29dd0f204b2fb349a7761a3a42001e4a7ff7f2ec27f075083d1af3138daa
font_02_sfnt_off0001040d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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