Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f203b2f14017879…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 11:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 32bddbf5420472869d5f314e2a73782e SHA-1: b9a9318d73cf00e45cd26f32a800beb3fda4f5d3 SHA-256: 2f203b2f1401787930c9881bdd0cbf42af7378d10ef49818eb094f915b6d0764
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, many of which are part of link farms on disposable hosting or compromised CMS uploads. These elements suggest the PDF is used to redirect users to malicious websites, likely for phishing or further malware delivery.

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://philabc.ru/uplcv?utm_term=exponents+with+multiplication+and+division+worksheet+pdf PDF link annotation
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/dotarun.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/64015792935.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/dopatupetugafijusuxomezu.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/96453488620.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/15744573936.pdfIn PDF document text
    • http://gardatrans.com/content/Files/94761672737.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/50673532600.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/11386615193.pdfIn PDF document text
    • http://zubrcup.by/files/files/vusutigusufizatijaras.pdfIn PDF document text
    • http://chieucoingason.vn/files/93494281014.pdfIn PDF document text
    • https://synersys.fr/contenu/file/61239570400.pdfIn PDF document text
    • http://com123.vn/uploads/file/noxetosusidir.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/dajowuxax.pdfIn PDF document text
    • http://dzbnf.com/upload/file///54418698869.pdfIn PDF document text
    • https://akvaguru.hu/user/file/26049331897.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a323b16309e---diwadumefe.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839c16312d7---23377298888.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/19c7244f45696963908e8882556beee4/24208006626.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/muvugezusibofom.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/94867847715.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/14087875280.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0640d3c15e---vizikafifozofitafesal.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021073108000391.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/sobijesukaroguxasaboxev.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/zakitajoxoranusizogitexa.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622995473.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_off0000d25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25D 11312 bytes
SHA-256: 22e88fc9c4ac53737726cba22cb615027e7741bcac6d0389f691559dd78277d0
font_01_sfnt_off0000ecd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 17964 bytes
SHA-256: 8d446be3f4e5effb1892eff3c18a1a000bed13051b7b62f783a5e347d29dfbee
font_02_sfnt_off00011b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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