Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e0c19c365c9724…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 17:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d8694117ea02d5632ac41c1e3a2bf195 SHA-1: 95c8bf4de1af02ae47263fc7256cc528c2139ee3 SHA-256: 57e0c19c365c9724c92216d3886c53d426fc94ed7888c2dde913bb8cd0ce3ce4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, many hosted on compromised WordPress sites, suggesting an attempt to distribute phishing content or malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=yugioh+duel+links+hack+android+2020 PDF link annotation
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9e9ed404606b1784e10fe2fcf2938065/81101344461.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/befidumura.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613241837e8cf---37877544216.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c459b33156---somoxirunokajul.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/barotogeke.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/22306578388.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/62663012080.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/wapawuvepupejobezisor.pdfIn PDF document text
    • https://digireg.sk/upload/18255740350.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/85897478538.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/risogagofixarofone.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/bejarejeb.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/65205794364.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140d6cec1807---naxizorubovelosodo.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/ledebubujifer.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614061cf96c03---12951235351.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/zelesowarixexobivarite.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/mexaxivisapuzat.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/xewuxapazefuviroxamizo.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/68439224995.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/ritoduzenoriwufajewok.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/35751592742.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/jijojisonarotofu.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_off0000d67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67D 18236 bytes
SHA-256: 83201663d341af3dcfdea91b9b9db41d3ca3353642f231b00a90b57f759ca59d
font_01_sfnt_off00010609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10609 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E20 10968 bytes
SHA-256: 35d97f6b73a734186687e7dfc604ee0f12262d9abf2f3f8435400268b34370eb

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