Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d47703be818ebd…

MALICIOUS

PDF

88.2 KB Created: 2021-07-13 17:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6be10bc49bfc80d6622812240c0f3eb8 SHA-1: 010b9aa8c4e0c2f74a0e566dce31f0a4ee13b7f5 SHA-256: f2d47703be818ebd2d9f87dae026aca3dcc017a6c38be03f26e0164b46d0f548
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple distinct hosts and a high number of links per host further supports this. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160944952a7c8b---zaribonomerizo.pdf In PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e25ccef518---51597423432.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/riguvakuxamejuleba.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/dfgvcpjbnd3q146f59mimfmbj6/28858657166.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/67485cc3b2953f2a30118023217c03f1/mifeparo.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/ripefilagojifinojifan.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/punamewo.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/76426645647.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/p3upc06vt612ddh0l06hb0j2n2/wabugegorimawubexasor.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/34707801988.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/311d75ea36595c077db5a8171113407f/99376748228.pdfIn PDF document text
    • http://oceanstatevolleyball.org/clients/879495/File/39153395747.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/73540339561.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4829b41780---josepurewix.pdfIn PDF document text
    • http://classtool.info/upload/files/vaxuja.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/34167684464.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/23628794697.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/goful.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/28645337471.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5beb61f4c7---rakirorode.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/0d940156f0409095d06888233a644a7b/35775846013.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/a2cc439e84a6d26ae499aae9fc50b457/nokevusizim.pdfIn PDF document text
    • http://metallpress.ru/files/53231958203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=letter+of+recommendation+for+colleaguePDF 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_off0000f8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 10708 bytes
SHA-256: c64f014a8e22479a4019398f14467ea4795baad499ba58b5797c407b8e35fed4
font_01_sfnt_off0001111a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111A 16504 bytes
SHA-256: b9c1b62dd4456d7fa4ebd810fd1dcf720a5400ea7c2d76902a7615eaab1508fd
font_02_sfnt_off00013b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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