Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ed9515960884bc…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 05:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bfd76644c177ef71c4c3ac734eaa370a SHA-1: 5854c66b76d87c33f6d4c713333d4bfdc332427f SHA-256: c1ed9515960884bc37a15ea54ed56bfcf75a460409455db3d761a9f8186b1092
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The primary goal appears to be directing users to external resources through a deceptive collection of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://susutour.com/userfile/file/kajorin.pdf In PDF document text
    • http://slsnn.ru/content/file/78662622060.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/98299397971.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/98303316919.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/bokikutareludalovisuxade.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/besumitasakata.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/75bdaf691d11760cae97995591e7994e/zewivu.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161435f9c9e467---jonizinus.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/nazepamokokomak.pdfIn PDF document text
    • https://akvaguru.hu/user/file/54675953249.pdfIn PDF document text
    • http://tercovci.cz/files/file/26262355352.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16137d54d03530---buzesogeruvomuwiju.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109081734493265.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/3i6cut7pid2dddieq1kc443khr/gasitozofigavojipivet.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/93083133747.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/57c7ff416efee42d683645dfa7655c4d/45063058694.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/zigerafexuvukudezupoju.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1ffee919a---56338647356.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/73693728952.pdfIn PDF document text
    • https://efnnma.org/files/file/damufobizatorerizujobi.pdfIn PDF document text
    • http://eko-uklid.com/files/file/mowopijubesarawifuzog.pdfIn PDF document text
    • http://stonebreaker.at/melawabu.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/tegunewafajoseg.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/30003264582.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/2443746356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=best+multiplayer+gun+games+for+androidPDF 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_off0000da83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA83 17280 bytes
SHA-256: 87b8e0d3a3cc3c96a985bb84007a23c93b9903d82955ba1647b7f73c49507a42
font_01_sfnt_off000106c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDB 11108 bytes
SHA-256: 5185485e84c14bee99dd4261f61853776f0826a75f883ac6db124873e81acc75

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