Malicious PDF — malware analysis report

Static analysis result for SHA-256 e02d5c72e13208d5…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 16:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a8f7186d718ccc81877a9746dd01aa9c SHA-1: c3a6f071f93b76e5a448e01d00b9f9395b0c3839 SHA-256: e02d5c72e13208d55fa14b386ef454b6f7ee873b1b27eacc4334e337525a03b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm or redirection scheme. While no executable scripts were extracted, the structure and heuristic firings indicate a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://przyklejki.pl/userfiles/varatawinokisezoladafu.pdf In PDF document text
    • http://autoscuolemontagna.it/userfiles/files/jodod.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/lekezajibil.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/36151151571.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d235d76bc2b---lerov.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099442a45471---55184868083.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/9522751882.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/75833131446.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/82585538511.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/87949634809.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/rixopokeribawomekov.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/7597671364.pdfIn PDF document text
    • http://rideco.hu/upload/file/94989516669.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/35002947178.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906b898aa4b---zuxafideg.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/solesenumetasemi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609234605d937---zokesatexelapev.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/55405490657.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3bf33ad87---tipilixutegositewakajer.pdfIn PDF document text
    • http://minhanh.com/files/rezitijasegovovof.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d750a2f88b59701ae61ecb9c2f61b16f/86354793362.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/sezimomaxip.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/48049929512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=their+and+there+worksheet+pdfPDF 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_off0000d7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E0 16892 bytes
SHA-256: c620a6e5e64afacf291082c340dc819816a85bbf6cf75784a76b2bf139d492c3
font_01_sfnt_off000103a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A2 10688 bytes
SHA-256: caef75f36ee2e565f30cb51bbcde13627285f70613d41c7052543b5b3eb6700e
font_02_sfnt_off00011c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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