Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a14ade3a954993…

MALICIOUS

PDF

73.1 KB Created: 2021-09-12 01:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e57afb823b9394bba46572575105b576 SHA-1: 79727a040d7cf51f437454ce275dad675966bc50 SHA-256: 26a14ade3a954993b0565873a93dab395431bf6a4720b6f572778250ad9fbdad
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, so the primary attack vector appears to be social engineering via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://medvor.ru/uplcv?utm_term=2016+phone+games PDF link annotation
    • http://goldendazzle.com/upload/quangtri/files/64573193745.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/popitalovunubawesowedomip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa70c28824---54552543983.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/718q43rg507fjqo88987omsgav/tigipimo.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/7174349358.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/93682367218.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/23971938792.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/zeboxolejilewosojizibuvup.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45893611110.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/magolejujibutemojugunibud.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/28521773637.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/11951214514.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/juvekonetorejexa.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/64505354731.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/24288745581.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/gelovarisagaxelaj.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/babumerugukix.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/bibapugowukupemusodid.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/7vnv2nujfqljcike65jdckk2fb/gexomirokidajorapi.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/koxuxaxebedilimamonuf.pdfIn PDF document text
    • http://apismorava.eu/docs/tavisazumolivuvarexibe.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/vilarex.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/70407461050.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_off0000ba07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA07 17104 bytes
SHA-256: 639ee270762b091fd178f022ed4c9a3ed58c2278f106ced938ecf1b5a0ece2de
font_01_sfnt_off0000e695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE695 10728 bytes
SHA-256: db4696f33e21fedd770afa5458e67f0a54a757e99614d0dc7b83bb33bc2528dd
font_02_sfnt_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1