Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e793261f1d5dec…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 20:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 776984de459defe81910179714ce602e SHA-1: e606af6a40195bdc946ae0b303d2166433f938cd SHA-256: c1e793261f1d5dec7daf6eacc41f2df2ac7b0c325c05d390cb1ddb651789dcab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or malware downloads, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The presence of embedded URLs and the overall structure point towards an attempt to trick users into visiting malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://allytemp.ru/uplcv?utm_term=fortnite+battle+royale+download+apk PDF link annotation
    • http://www.smartusb.info/images/library/File/11603819043.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/75488771630.pdfIn PDF document text
    • http://tzsunup.com/upload/vewarubovomilawonujafip.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/lumenejumejibomafefukawel.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/vinapupokijaji.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/sufesazivinisideseromuzux.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/rj2ri44kb8j5ns6oo0ll7pa1qf/75669229169.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/lufififumanumubom.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/mixoj.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/88773307458.pdfIn PDF document text
    • https://izr.fr/files/xupetusobimekaxibu.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/66e60da656546c1f296b678796b9d7b7/53935693965.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef2df7555b---padaxilabijaw.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/27886114550.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/f5fe725371ea04885e714816950f1bf0/31696563777.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/jaxilirot.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/javanun.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/79699294183.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/kitorujedupulatedogesukos.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/xejalid.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/fomedujukonopevere.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/zotitivelalomu.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161372b85a34fa---30874313346.pdfIn PDF document text
    • http://hongdacable.com/d/files/84023844194.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161313081bc872---zugibujubadisijinijin.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_off0000d809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 18444 bytes
SHA-256: 2e18acdd7033aee273d2cef15a917e69b3cefdef44f0d921a918d38f1b402c5a
font_01_sfnt_off000107a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A1 10624 bytes
SHA-256: 446d2b15ad21fc82c1f37ef41b0dc25186efc5a47595da5e0a45873b99906491
font_02_sfnt_off00011fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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