Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d3f83808b98b08…

MALICIOUS

PDF

77.8 KB Created: 2021-07-20 21:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e7a529ee0e449b47633c306664815763 SHA-1: ee52fca8cb56937ba7230dd28a6081d4c265684b SHA-256: e8d3f83808b98b083e7ac778618f06f3e45b982bd18588c1e639d1f6827c942a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://zabradli-znerezu.cz/userfiles/file/58353310717.pdf In PDF document text
    • http://beiks.info/public/file/40242625896.pdfIn PDF document text
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/lajofik.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bsssdmrk5ua87819d2j977hog1/jovizilado.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/pamesu.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad511664d15---92111279799.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/aa699fa73401bbf4ada8081b9a99f12a/69687435549.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608246908e9b4---82759642711.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/47491268958.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/7d7a61c179ab8c2219bcd66d419e8d0c/85884400636.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/xamekidanijapusujenobuz.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f30bde56ef---30248794179.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aace0aae977---65301318645.pdfIn PDF document text
    • http://wrhsclassof82.com/clients/d/dd/dd94ad2327da436b0bfbe5937c3cc641/File/75875531937.pdfIn PDF document text
    • https://ancoraeducacion.com/images/xorajivoxupulixizuvakibox.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e8ffeed0d---97253432213.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/wuputokam.pdfIn PDF document text
    • http://imaginove.eu/data/Files/82914696189.pdfIn PDF document text
    • http://qca.ch/userfiles/file/70509923974.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/0e9d22b6df7f7d8d4ab0335fb49688fa/rajotil.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/61002743964.pdfIn PDF document text
    • http://tcihk.com/userfiles/lasedovox.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/bapakonitaxofotitozidarij.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/57987483322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=anytime+and+anywhere+synonymPDF 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_off0000ca65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE277 17796 bytes
SHA-256: e145713e77b3507ad6a947d3b84690393984b96914f3a12f854e796955437ce1
font_02_sfnt_off00011179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11179 10648 bytes
SHA-256: a2518bd45b04213fcd195500b565379ac4cec3f5be6bb2ac44c826df4a914055

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