Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7740f79f9ec345…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 23:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 305fdaeda4934a227779fd164b2bbbc7 SHA-1: 9b34e7846da825f192b61b2ab7d346550f0e1aeb SHA-256: 3d7740f79f9ec345667b353fca5017f295cde3b84cf31f03d0bbb541351a846d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://smidgel.ru/uplcv?utm_term=learning+chinese+mandarin+pdf PDF link annotation
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609f71ba9fed0---tisuniwam.pdfIn PDF document text
    • http://c-six.it/userfiles/files/6605150002.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf3c81d56c---60598508907.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/fuzesapexip.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/67635602623.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/5929e5862e18d5cce751f9f3f4c4222b/28441373731.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/69364aac0a53f05c95fcab8d7c5703f2/femazupuwidevi.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/83089699791.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/dakozeki.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210730204806.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/83596357051.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/mamuzem.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a32dbb032c---4337782670.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b770f1ba5---24861190354.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/venipuxabejasi.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/9202811cfa6a3039bc04725239f9f372/20600007981.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607841002a621---mifejomeduwakadefejegi.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/vl41tbb5n7rg5lgo27l7okj1j3/69717594471.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078126518122---kusodotosebirageto.pdfIn PDF document text
    • http://deforma.it/userfiles/files/85942113799.pdfIn PDF document text
    • https://haidangpc.com/contents/files/sipixubapet.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf415830d21---pirusarikumipinaxigivilij.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC71 16460 bytes
SHA-256: 77a372fb9adfdd902abdc01d8465541f30905b1b90887ce814d03ed2f663f7e5
font_01_sfnt_off0000f6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EED 10760 bytes
SHA-256: a3400e770acda3b0225f3722265d324383e30a9fb1ad8a0ff149be896861a876
font_03_sfnt_off0001272c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272C 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878

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