Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e0883057a15aba…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 18:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9c9efbe36059e669e6f5800dc762322a SHA-1: 312913475a95dc363ead3678539f3d48606e29c9 SHA-256: 61e0883057a15abab45451f930c39effbd6f4d1f9dd539e4063b9e97ac8779ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://huntic.ru/uplcv?utm_term=start+up+construction+company+business+plan+pdf PDF link annotation
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/jawami.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/as0vf0fg4sv0n8iso8qrcn1cg1/ziwezoba.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/fubodepemamuxa.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/7460774932.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/18226422065.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/54228252362.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/dhth91f5aoigm9lvi9pl9uuvbl/dikatujegidajopiji.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084338d8ddfb---lowotabibov.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/au1pqrs9341ovdq68feanovl42/8186593896.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/kipido.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/57126414510.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/xifexozefidazewixe.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f505cec6933e82be277c3c89a43f5f02/newepuminolefazawovizat.pdfIn PDF document text
    • https://i3mit.com/shopadmin/upload/files/zugevefoxil.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c805b4abce---28638094359.pdfIn PDF document text
    • http://punaide.com/userfiles/files/66077138662.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/pevisapuzijeru.pdfIn PDF document text
    • https://sanidom.pl/img/file/30044675581.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/62003480279.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/forujajusekeromogageme.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/89047328187.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/45800338141.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/69d79caf410ef2c46e218e7266b6f700/2468153140.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/3063997557.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/a0880a6211d4db9bf078d7c3e6759354/16131417886.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609513df168ed---6653848145.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_off0000dce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE4 16176 bytes
SHA-256: e895e74ea860b941d2df94b4b794b2bb58ea0f9183c97bece0f5db9c3160024a
font_01_sfnt_off00010624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3B 11212 bytes
SHA-256: 2be3bdd21e8ef5b9bee28e6ed4adcf51d8f102971ec2f7a149a59c4796e0b478