Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83984be1ce63268…

MALICIOUS

PDF

88.9 KB Created: 2021-07-31 14:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c7bff7d76d3811008e284bf6468b269c SHA-1: c16110cbc7f033c6a9ee01ed03713dd55b5ea9de SHA-256: b83984be1ce63268ef263ed1ecc4800da9c9d37e762e45c8f9200d01d1932275
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://laborke.ru/uplcv?utm_term=como+resetear+impresora+samsung+xpress+m2835dw PDF link annotation
    • http://aotwresort.org/ckfinder/userfiles/files/posegejosesaxuxujojudofi.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609c94ea61f8e---toduduni.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df35c75d567---64461426632.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/33512490532.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/32861730894.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/bubedumosususufuge.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/gopikubuwunudawin.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/xowadusegugusoxidovuwe.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609850360a9a6---gisavimodezijugedosazu.pdfIn PDF document text
    • http://lukinserv.hu/file/74778385597.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/bd5921ef4863a1bb674cd284b82a577a/63474735598.pdfIn PDF document text
    • http://wardwrightself.com/clients/863644/File/89219073872.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/81422989674.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c7002d3a757---53025462218.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/23131995374.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/70468925327.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/rinetekubavadobibakufuzad.pdfIn PDF document text
    • http://amdind.com/userfiles/file/90124841782.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b08e869c58d---tosivomoketogiwusil.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/85794713980.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/13721498916.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/61472132907.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/c71f9075babf79b425d89591fe816b68/52006421005.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb41e3f0499---takobatuzirojawivaxopuv.pdfIn PDF document text
    • http://rahwayhigh.com/clients/42761/File/timevobelo.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/46969989818.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_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 11644 bytes
SHA-256: d2f7052c2b59b0050981ba67855d316cbb4bbe11f88d2d9be32bf7b708d85087
font_01_sfnt_off00010a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12263 19400 bytes
SHA-256: ce3b84beeb6392436329b724cc5bdcfb5decd8eeea57a81ddd0aae3fe4f19ca5

Open this report in the interactive analyzer, or submit your own file for analysis.