Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea696980c2d02e51…

MALICIOUS

PDF

70.8 KB Created: 2021-09-18 04:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cc09fef47bdd7941afe9785e47748db9 SHA-1: c4efe170c52182659ad3708581ed2ed4dc7a144f SHA-256: ea696980c2d02e51284b68b3019e8e91162214b2e20b8df861ba063d20ff0cb4
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites or disposable hosting. The presence of multiple external URIs and a link farm structure strongly suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://chcial.ru/uplcv?utm_term=bin+to+card+generator PDF link annotation
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/riran.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/rotitow.pdfIn PDF document text
    • http://relindalouisylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lazenepuwe.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/runabenorib.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/xunokivugosowesodezube.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/subujewafalokozut.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/72019872626.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/bavosuvusujukimu.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5da0ae58c---mosirajinapazuro.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/91003477340.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/xibelupasavadomuruseje.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/53518683410.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e94a93f9502280b8c21f42c57dc03f6a/7778538265.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/rotimeguwukinerisemaru.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a3fca4ad3---26903044925.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/94627479327.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/67fvse95106hf199he29e9ijc4/22848661651.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/wutikitikovusemoruduw.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/xotomisefuz.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/77188246215.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/xibupututaxaponetakup.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/61033804912.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_off0000b4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DF 16240 bytes
SHA-256: d3770a76fa7bfb7343425a4ce31134fd3145d95433d8c49de96399181ab1d8a4
font_01_sfnt_off0000de54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66B 10384 bytes
SHA-256: fb1b027c8de0801ce7ac20c218753b6f6911409d29b8f9eec4dc503b3c69003a