Malicious PDF — malware analysis report

Static analysis result for SHA-256 3263f110aabcea29…

MALICIOUS

PDF

85.0 KB Created: 2021-09-17 16:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d00aa97962034166d3533a2873a3257a SHA-1: 19c2b099f490fb03e5d761590b8c3c91015a4857 SHA-256: 3263f110aabcea29be7eee0327b9d3d640db1a62de20e0469f0483f2b69bd93d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://irlanc.ru/uplcv?utm_term=mp4+to+mp3+converter+by+link PDF link annotation
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/2c36ac100e395c69ea0f15cdf46a09b7/19258942716.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/sb8cdjrupob9h0guhl2gtaoadq/55525135672.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/11721539021.pdfIn PDF document text
    • http://byecook.com/ckupload/files/84377711207.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/m46s6gue7fre4l62avr2rgk4uq/mamulikilasiwage.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/fokedakududup.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16134bccb4ee47---69711683521.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/4969420697.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161447e269cb18---fafewotatozekano.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/54336213403.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/28568060258.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/40446192673.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090310213273499.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/mubajumibukimemikoja.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/21723878107.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/84501621155.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/49134046197.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/19be5265d03764c0773e1e880686324b/30030005055.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee44bb9cec---89799412624.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/gefetalud.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/44903216978.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/96542798955.pdfIn PDF document text
    • https://kopari.hu/files/file/bivikujizoreguv.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/94334594193.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/77401951582.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_off0000e649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE60 10860 bytes
SHA-256: 0dca74f431d5c8222e641cac2fc5ae37260f72bc1be478846340c06b84dc2040
font_02_sfnt_off00011749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11749 17952 bytes
SHA-256: 988ec62941c89dc848ad04d7272350739e9bf9f2b61d9781489fe8529d044259

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