Malicious PDF — malware analysis report

Static analysis result for SHA-256 60f82f803a8387e5…

MALICIOUS

PDF

94.2 KB Created: 2021-09-07 14:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 436b71ce9af124b4ebe20afe819e721f SHA-1: 8e2229060fff53155fc8f754129e9967015b0287 SHA-256: 60f82f803a8387e570fc10a2f8b20dd5111e5179c57e58ab6e76dc7fb10e5fe5
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating it's a phishing or trojan PDF. It contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the compromised CMS upload link farm heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://k-barrierfree.com/FileData/ckfinder/files/20210904_A0E80F6A9AB38D51.pdf In PDF document text
    • http://hpworld.hu/data/pic/Image/file/56256849560.pdfIn PDF document text
    • http://www.emailposte.com/pictures/getogujazefab.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909f67279fc---lusogepa.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/lirarebokuvufudo.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/zoxivinetizigexizoxakun.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/505d4cf53aa80731fd50f041dbdbdccf/ledutepibuxufeguwu.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8f64e75a6---niganiramogiki.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57245bd32---gibesexigufixojupewew.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/45040027100.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/1808287419.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/84998816446.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d837071b18---pukuvaki.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/roputizuwoduwiw.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/vuzelixojimazenirodu.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/a35832c3a1ae52286b60c6846ab3e06e/meguvamuxuxuduvuturumi.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a9047b80ff57d2a4f66a0d32ecb327fe/9985948396.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/nubekorimozo.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9279ae251---47271334633.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/modidasifasu.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/58304251585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=weightage+of+chapters+in+jee+mains+2017+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_off000105f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F1 18628 bytes
SHA-256: bb6510843ee47cbcf8f19d41e2b909f032af33d33d9b2edbb5193da51941926d
font_01_sfnt_off00013691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13691 11488 bytes
SHA-256: 886e7945aa0206fb4957be18b4a77b8ffa9346cf75bbbacbadb2e5a98553ef6d
font_02_sfnt_off00015181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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