Malicious PDF — malware analysis report

Static analysis result for SHA-256 7872cfb8020a1374…

MALICIOUS

PDF

90.1 KB Created: 2021-09-04 11:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7a68693b1d6293dabab440f8bd438905 SHA-1: ca4214413f96479d049fd7eb865656f6d0048d39 SHA-256: 7872cfb8020a13741e6ba933c00428379efecda4aaaf04f747955ab7ac4b830d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript and numerous external links. Heuristics indicate that these links point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the exploitation of PDF vulnerabilities to execute malicious code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://catamma.ru/uplcv?utm_term=types+of+drilling+fluids+pdf PDF link annotation
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/70556752720.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/jusasedobesejekadudu.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/pinemigur.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079877d4d2cf---55206292668.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/nenisi.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2daa5292e---kowezidutis.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a718053f7e7---ganamobobe.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/lataj.pdfIn PDF document text
    • https://triosms.com/userfiles/file/mitotaromexawoxemadezesi.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/56952817909.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/l815q8t88mbafn09e30h9jki07/jebezafamuzutulik.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/31785998860add459b6f7f.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4bdf3a8f7---48757085654.pdfIn PDF document text
    • http://contelex.it/userfiles/files/81358081895.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/54513255769.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/9969830787.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c782c73eca4---44038536307.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608324481a59a---34064475385.pdfIn PDF document text
    • https://zhongzing.com/uploads//files/202108050305407420.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/99880710045.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/zisodivido.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/60498534043.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/11300256016.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/94637342696.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/sokotuvubi.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_off0000fb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B4 10592 bytes
SHA-256: bc17f8808bf336e184c8a541154b3618d72c1cbf9a2e3bea767df91fa54f7042
font_02_sfnt_off00012bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBE 18280 bytes
SHA-256: 911f9cf05ca1935d5dc10893697c3ff0ac2a70508b86abb3163a896f72563fdd

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