Malicious PDF — malware analysis report

Static analysis result for SHA-256 e758d21ff1ca3905…

MALICIOUS

PDF

72.3 KB Created: 2021-09-30 19:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6b4797b2a69fd38c2e4237f11a5df0f5 SHA-1: c74156bce9f13e83484b256ce22920e194655f90 SHA-256: e758d21ff1ca39056e2817ac430490abcb1c19b26405c44bd4382ee11248350d
164 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to compromised or disposable hosting, suggests a link farm designed to obscure the ultimate destination, likely a phishing page or malware download site. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic further supports the idea that the sample is part of a campaign leveraging compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://efuegypt.org/userfiles/file/52870623825.pdf In PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/47474032922.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/jikufe.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/58640094529.pdfIn PDF document text
    • https://asiapharma.la/files/files/74050957218.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/xezasodijetulaxurokupubex.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/5b219c8923c93de098eea7e9c61f4804/62944880281.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138a458ad757---jozoloroxegopa.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/rixodanolomisewo.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/13904556199.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/wirotovetapololuxenebibud.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/21050726856.pdfIn PDF document text
    • https://phr4u.com/files/77278515704.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329f723eb47---tomotiwobizimigef.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/20111771274.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/zasedemezisakomij.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/zogizulodogu.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/gilope.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/kamolan.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/kisokavubawixizogusara.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/87180156349.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/86039187340.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/53963673069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=javascript+pdf+for+beginnersPDF 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_off0000b1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E1 18904 bytes
SHA-256: 6d0463a9c6c032eb7a488a570bb5c9cb0000013a0cb643d20399cf11a7231c20
font_02_sfnt_off0000fa99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA99 10948 bytes
SHA-256: 18bfc90a7c9e67b2284a703d895371a2246db321e80d5d0c2108df702c7455da

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