Malicious PDF — malware analysis report

Static analysis result for SHA-256 98452746bb9971de…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 12:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bbfd788505bbc750c386181c367d3a8a SHA-1: 26b22a9c2f6d831f1215f01edbdbbd50dca90dae SHA-256: 98452746bb9971de1798987349759ae171e667a1feb8de24c26157e2fc787243
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. Several heuristics indicate the presence of link farms pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the final destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification, likely involving phishing or trojanized content delivered via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/56151994628.pdf In PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/30db5f6c8bf8778eddc4d533dc1ddd33/jepogakisuf.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/10132501849.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/18106812101.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161445e6f3976d---mezawekot.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/40854119037.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/kibamudefipefu.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/suxepelavosososab.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414d7690c7c---saforulipewut.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/weronunanarifop.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/bajadikunidaxixesawagop.pdfIn PDF document text
    • http://gazetavk.ru/img/file/vasekuzegorilat.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/34002163609.pdfIn PDF document text
    • https://33mobility.net/uploads/files/nuwigolatidigupema.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/85533730255.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/jexexanid.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/99965774294.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/41787458022.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/nobawonigenajunanadobute.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/gejuluwusodadipepu.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/65433408251.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/81023457353.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/8607372188.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/nimigelixuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=lord+of+the+rings+pdf+onlinePDF 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_off0000b33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33C 10572 bytes
SHA-256: 2abf9a5f3d05a464f78ef6ff1c825eaee7fa48f099e894401a69307f233ccbe5
font_01_sfnt_off0000cb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB01 16196 bytes
SHA-256: 982df2ff0f9a0dd1e1a52505397cce7bb0ec705b368f7eb260377af233fc61d0
font_02_sfnt_off0000f430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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