Malicious PDF — malware analysis report

Static analysis result for SHA-256 3190f2ea8242fc50…

MALICIOUS

PDF

94.9 KB Created: 2021-09-11 12:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7320f57e548b7cc1ef7c869485e75f62 SHA-1: a896dcd21491268394d04e9bf05a65d1769fffbe SHA-256: 3190f2ea8242fc505e0d7b31127428b9e86ce5617edd34461032fc4988502ffb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://marbeyoyun.com/calisma2/files/uploads/86469663881.pdf In PDF document text
    • http://hamayeshniroo.com/shop/file/komajomukuniwobej.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f8d92451a---28178350051.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/gidekagugu.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/54419301261.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b94313b8---zogigejevofu.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/69302879361.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210901_66CE60D98DC223A6.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/wobuwanomunanagonatimuw.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/88b616acfcd4aa8149a1badc63980eba/92995422811.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/xusobizotujofixan.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/mabemikapagapelutupabep.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210908050707300225z9yvd.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/90618248657.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/7685204433.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/fubaludigedotinino.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/witikopin.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/mepewoxemubarewumev.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131428b64f20---34094616252.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/xasisux.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/birafezepewilide.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/porogefodupazimadaramejo.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/wowigopenixomuxufofix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=convert+android+studio+app+to+iosPDF 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_off00010efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12712 10536 bytes
SHA-256: 283b1d3ef09ed17c017c7b0479eaa4ddf8624d8f53afb826abdfe3aee2c62fa7
font_02_sfnt_off00013f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3F 17752 bytes
SHA-256: c14858c4922aeb96a2a73f3bf56ddd19652be668709b9a46a75c33e414a20e65

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