Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d08faa20325368…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 01:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 207e516d3bc1efe5ba82fc9dbda468e5 SHA-1: 439665e3866ceb3e27044433fc12a7600e020cce SHA-256: c9d08faa20325368b085843acd1b1afa2657a812d4728632ba67e55c96732e44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The document's structure and embedded links align with phishing or credential harvesting tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://latework.cz/soubory/69375196631.pdf
    • http://supermarketdv.ru/files/file/vowati.pdf
    • http://ats-dz.com/userfiles/file/xidovon.pdf
    • https://fenixfalt.com/userfiles/file/bojapoxuzawikimefom.pdf
    • http://hasadtemizlik.com/upload/file/kodorepelegokapozolam.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/tipuwamubitewevuxi.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a30ff1ed956---rixizixuwogiditerer.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/dbcecb030c82e390d376e39c1d4bd022/26401918743.pdf
    • http://daivupaint.com/img-chamthi/files/39649930332.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c677d3c9ca5---85095378680.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/no0mbhu497t5bgc4esim0lq2k3/dosokoje.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/b00ss6be6livru4rq2l6n9j32t/webisaged.pdf
    • http://beijingxinzhi.com/userfiles/file/20210812061952_160411746.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae657b0b74d---81895192911.pdf
    • https://fontaine-eva.fr/userfiles/files/69055398774.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d3add77a8c9d84f7e6f29dfd40c26209/37452447460.pdf
    • http://www.annaleehuber.com/content_files/file/rasatenesu.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/312579c5ee774692b6f8427621bf66a6/nuganol.pdf
    • https://svingenieria.cl/userfiles/file/zajaroxaxezevoj.pdf
    • http://feach.ie/images/uploads/file/50213101311.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/ba75be562eb4abc7d68eb45b0c644b00/21726707182.pdf
    • http://bephoangdung.vn/uploads/ckfinder/files/vesikonepel.pdf
    • https://tekmaker.com/upload/files/werevigub.pdf
    • http://honderhotel.com/UploadFiles/FCKeditor/20210816095657.pdf
    • http://www.sport-konyv.hu/userfiles/file/vinadotaditefikejisawabaz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=kanger+dripbox+160+manual
    • 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_off0000dc2a.bin
3ee16f3954fcc28eee1a415821df1936e9d748519169c68a31ec83ead54bc007
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2A 18748 bytes
font_01_sfnt_off00010dc1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC1 16792 bytes
font_02_sfnt_off000125d8.bin
4a9bd7f5987c14081b8ed572f82628afa65dd792d7353852292675812b3e5ad2
pdf-font-stream PDF embedded font (sfnt) at offset 0x125D8 11144 bytes