Malicious PDF — malware analysis report

Static analysis result for SHA-256 50fa62109f0b951b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-16 18:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 81a9bbb221d2e716422020ac32205698 SHA-1: fcc5247100f2f5706d73dbdc130d79245ad59082 SHA-256: 50fa62109f0b951b7da884c22688002b01d44b0b685e7d59ab9b471be1abf893
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

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://infrive.ru/uplcv?utm_term=pokemon+go+download+ios PDF link annotation
    • http://northmarking.com/userfiles/files/xebudadaduzila.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/58917458090.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/27ccc4317240c88a9f3b74c80e350e7a/pinazamasizedowaborofin.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/53549514090.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/pabixeminogijekipo.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/bufomikuzubaduzuzopoguv.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/17106867993.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/89518799455.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/josusawo.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/63006762852.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/84548133096.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/wilifajutuvut.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/tabareronosigopavop.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f23d1f0b53---kosewo.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/36196649167.pdfIn PDF document text
    • http://www.bandungmesin.com/file/jutitagelosiw.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/63becceb339352c9df111d3c3a6f7986/87541182276.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/tugamegepadifurakelelu.pdfIn PDF document text
    • https://atrax.hr/files/togid.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/lejideduvi.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/zogogegodabiwijalifoneri.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/10540223968.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210916_18CA3FD6521320C2.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_off0000e542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD59 10572 bytes
SHA-256: 848d1798f0783531b0631efd349894f7f55923f2823be11a290e553aacfca5ba
font_02_sfnt_off00011549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11549 17088 bytes
SHA-256: 4934a176ee0580dcc48bcec47f9f6aa3703d1917faeee70de2190d2b63ca269d

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