Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e79360fee43e20b…

MALICIOUS

PDF

110.7 KB Created: 2021-06-29 03:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cb8c3964038c2d5679df13680026f7df SHA-1: d5d735c0820be09e08f9743263f90b74b22e17f5 SHA-256: 1e79360fee43e20b797a12c17ddf70355f06a59bdb1b352a56b4d106e59632b7
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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 http://beijinghuojia.cn/userfiles/file/muxupalobinurojan.pdf In PDF document text
    • http://amandatravel.com/userfiles/file/widuwozeparenetodoxe.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/kusatafozik.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160795b12bce5b---17613660251.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/74746911127.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd24c673d4---30108755559.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b58e4fa45a58d914e93aa3fdd43fe2e2/vikifufonisakuduka.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/97420598555.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/xomeb.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c2518a943---27984217819.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/228071ae22ddde663dbdec5185376ad1/vogusubaneguwisitazek.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/gadesizemiza.pdfIn PDF document text
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/xatuze.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ab3c1272c---92388694014.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e02886e653---98722392950.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/sbtig3p6okkkb4iurd2qshfhpf/45366047294.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de4f18a25c---13708592793.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/piwog.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0dd71afdb---87220021469.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/1168287630.pdfIn PDF document text
    • https://chp-travel.ir/data/file/48597029523.pdfIn PDF document text
    • http://yoron.net/up/files/zivixixabapiluduzewep.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4adf1b75---xefedabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+world+development+reportPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11415 30300 bytes
SHA-256: e16c5e4597c3eb3cb624822c07502cf159b2ae987455b109312a5fcf198b45eb
font_02_sfnt_off000165e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165E8 17196 bytes
SHA-256: ac490352803b09aab22a5425307b8e645eb31a3c2691a45f4ee497f1178fb777
font_03_sfnt_off000192a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192A5 10804 bytes
SHA-256: 9293655edf6a1f2f9b6c6988c73b0df4572f5147efd05b7bc914ca43759559d5

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