Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b68180e386ea52…

MALICIOUS

PDF

76.3 KB Created: 2021-08-01 06:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be11ae9948a7172b46826c5ef1f7e98d SHA-1: f5097357181c289681e1f86828a37820e9e74b9f SHA-256: d8b68180e386ea52acfe0841af48f5a06c9e2106e878ee560d5e0e71b22ef944
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://vandolderskb.com/images/usr/dunekomewafigabo.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28498bf2eb---jiranavejapofesuxilava.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/zuziwavakodoweruwilewum.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f9ca8e508---majopavitejovoraduxosok.pdf
    • http://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/jsmidce9um4lqhok6fgfe9ghh0/27150649954.pdf
    • http://cleangroupbd.com/ck/upload/files/93640030452.pdf
    • http://tks-forever.com/upload/2021/07/07/file/demogavujetixidesutija.pdf
    • http://ghalemdi.com/userfiles/file/pizesazozogokezenazik.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/8868527b306cab467b0659379ccf4ad5/16651598225.pdf
    • https://ayurvedaemart.com/uploads/file/sutotizivuw.pdf
    • http://www.kotolantopeni.cz/files/tarofesukeduletisukafe.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5f3c72bda9---65043153426.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/2od447voek6noas9813beb6j4l/nijewiwogukoferidi.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/b31bca3c839e31ab2aa640ca82b6206e/91651991754.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/063bbf357b6fbbf808d049c0b9c68157/51129075513.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a99bd588255---guzebaboserimisuvem.pdf
    • https://beyondpins.com/calisma2/files/uploads/91962322177.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160721de5ae63f---64718149693.pdf
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/lutus.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8d3f38a9f---29485699529.pdf
    • http://ypperfect.com/ckfinder/userfiles/files/gonebizanagenonujakukun.pdf
    • http://teplospectr.ru/images/files/xezafokukuvuf.pdf
    • http://enotecagaribaldi.it/userfiles/files/44563972121.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=yeh+rishta+kya+kehlata+hai+episodes+download+mp4
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4a5.bin
ed9ffdd776f54f1def869f917f071f07690b1161e04003940554ed0ce195ccf9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A5 16444 bytes
font_01_sfnt_off0000ef73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 16792 bytes
font_02_sfnt_off0001078a.bin
2165d3c41db44433c19208df535c28c7403700207477df12135422123617e593
pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 11012 bytes