Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ba10925de0a545…

MALICIOUS

PDF

94.2 KB Created: 2021-09-03 10:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9552c4759458883fd8b133df5070d9f8 SHA-1: 93a72967fb6ba1d94047775ac784f0dbb6d97882 SHA-256: 78ba10925de0a545db995fca2d3ec78af66d825a1a18081de75db46bcd868086
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://hoclaixebinhthuan.com/upload/contentFile/file/56731687503.pdf In PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b0ba4638b---juniza.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/fosanafenexana.pdfIn PDF document text
    • http://myphamasia.net/upload/files/62467743937.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/natepinulivoba.pdfIn PDF document text
    • http://gibisch.info/files/files/tafotir.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c334b05bb---95806614172.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/81472768894.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ff1f836d611---bowawoguxeko.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/dofodepuvibidorisuf.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/julezukaze.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/76095259349.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/vezujules.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/49921187648.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1610570846430f---18571434982.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/nisuvik.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071db8f6289e---rawupibimasebofiminudifaz.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/resexutiduwetemifon.pdfIn PDF document text
    • https://autoskola-scp.com/files/faburakukopabakisi.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081e55994cec---fafal.pdfIn PDF document text
    • http://hongdacable.com/d/files/58425251500.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c1d458801---53531080805.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/26385b9e8f564453da2e9e1a9e561c01/17665776262.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b041a60eaad---bemuvexonoxoxi.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/ab36ebde1384b03052442ef7889c86c2/zaladovumuwabudamelulozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=digital+beamforming+tutorial+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_off000107bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BF 19436 bytes
SHA-256: 3f83911aef8405b9d85cfe1058b5a0873a938a00155f119999a02bff6fa3b2c3
font_01_sfnt_off00013a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8A 10916 bytes
SHA-256: 3eb27100544ee787dc63dfffc0beab0ad02c41b390482bc240dfd9d91f50209c
font_02_sfnt_off00015356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1