Malicious PDF — malware analysis report

Static analysis result for SHA-256 5acb00672c6b7054…

MALICIOUS

PDF

81.2 KB Created: 2021-09-04 01:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aae8df270bb6feff01843e99b725f003 SHA-1: 58d4071039e6f083d31420c417361797179e2638 SHA-256: 5acb00672c6b7054db6cc1ccc420d2b7c17263bd3611a362d99ddb2f5b223369
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript and is identified as a link farm, with several URLs pointing to potentially compromised or disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://basaritarim.net/admin/editor_resim/file/bemukuse.pdf In PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7d927bc1---kijimezoj.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/mowuteruzugugo.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/xesujimagi.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b40ddd30be---wasodutodanesobofonuzu.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/1546075264.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/43511494631.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/risavegikitelilolukudob.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/wozamobexaxodakaxiwatoz.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/1242959399.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/v66dbudll93j2i1d2khac46pk0/17897237767.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/nunomunapojabelij.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/874263134610841993f1f7.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a445844c1a3---zujipimujiruvepo.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/rosasudededakepiruze.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/dudivekejixuremikivez.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/17962121500.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/rutamax.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/jowetozirukomigeja.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/zatozijipokimutow.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5f66c75a412c2233a31587bf1111d961/47570719623.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/92192104fb6338ad836f18dc82ed11f2/46684284015.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/iec662jv0dqk1ppoaauvkfbvfa/41244188739.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/78468016839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=origen+del+patriarcado+pdfPDF 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_off0000d866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD866 10652 bytes
SHA-256: d9e0f3a811cad63a9b635098f5b9a48b126f1dda8badabbfb271975d2d0524c9
font_01_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 18224 bytes
SHA-256: 9508a48fafe23c9830a6876ed60740eb03e5bc87ef8f78e977f70f0d1b2b1df5
font_02_sfnt_off00011f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1