Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf18d9417d122819…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 21:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e8be0b02f37853ab951afb54a40cb2c SHA-1: 51857093fa560a8b84485b1d723edc17841220d2 SHA-256: cf18d9417d122819f01b575fdedbb5d4e8df5ac1ab219e263d5a3c1707e1228a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised CMS upload storage and 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 0.9974

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 https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/4a05f6b194f602cebd339a74719079f4/mivabedugabasikifud.pdf In PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/binuloji.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210902071438.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/54169553560.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/nugejifojowanosifagiz.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/tegeronuz.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/94618350415.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613083b2c5ee9---mipojaxabulu.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/48786698458.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/boruduxufepugoperamuge.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/31086706035.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/givuvadazazudukupujetofil.pdfIn PDF document text
    • http://ymmicro.com/files/files/10345993019.pdfIn PDF document text
    • http://moristas.com/userfiles/files/7951226957.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/moravokilu.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/90725967181.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305f5fb7fc4---37013786469.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0008737c5---fepanubowawededarepowusaz.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/wolin.pdfIn PDF document text
    • http://grabnerestriche.at/35935247377.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/pakozatuwawokadivopevuxuv.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/madovodasobuwupatodota.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/rebigonujedibujukevanot.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/limavefuviselodureji.pdfIn PDF document text
    • https://akconta.com/uploads/files/13322256296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=capitalism+and+marxism+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_off0000dd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4D 18248 bytes
SHA-256: ceeb59f39015fff83f0a620af29a893187d4865e23aa722db0dece386c051312
font_01_sfnt_off00010bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB5 10540 bytes
SHA-256: 0b5400038ac508e8236f4ca142d5237d5cf91ff074a84b5b961c5c303180151c
font_02_sfnt_off000123ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1