Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a250333161edb10…

MALICIOUS

PDF

92.4 KB Created: 2021-09-05 03:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 743fd5680685c14898bf145572ff7d2b SHA-1: ec0a8844e8dd7dcb423156b93c8e2a282c421165 SHA-256: 8a250333161edb102bd20a1a9019dbf01c172602bd43ea89dd02bfa9377f365f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm hosted on compromised CMS uploads, directing users to potentially malicious PDFs. The presence of embedded URLs, some pointing to compromised WordPress sites, suggests an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/62270215636568a3b69bd515913b0b1b/popapasuvagufidilovoxuzo.pdf In PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/kedaligidogutovasewedu.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210510/file/jupuzej.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/550169601a43c0e393dbd55a14187225/24236780892.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/2186168103.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/0jj7qncl21dh5kv4l5cleaq0gm/zumomorapefozusifu.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/17947065843.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/80f0ca5b4904a8a4f553af3ba94aff82/dorafof.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/gojuf.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ecd25f10f---79177913494.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/8d551d381cb4f276d051927fe1bae22a/29611414179.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/nomolemifumu.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/bdcf9b67ce4c43a1a2426ea35e4054c3/bowarusenakotul.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/e568c305fe1945e799f4d2f0b10ef533/43946176003.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1d4f156082127f592cff16e1c4eb5cf5/xidobunupu.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/00157b201335c06bc2e446a3bec6e4a5/demijal.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/kokefedebevobodufasu.pdfIn PDF document text
    • http://nsureunion.com/clients/71556/File/15733781080.pdfIn PDF document text
    • http://fructusartis.com/i/File/58025654312.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/gidakewirop.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9e3c5ef0f---wewowigexuvawuvuj.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/14121541562.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/ponuzokinixur.pdfIn PDF document text
    • http://armanetti.com/images/xedewijejimisajiju.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/50529657451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=clopidogrel+bula+pdf+anvisaPDF 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_off00010274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10274 10912 bytes
SHA-256: 6e7032e194b5565bc83df7a2abf5f335f35816a1b9a440f25f958dcde8186c77
font_01_sfnt_off00011b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B67 19008 bytes
SHA-256: 6c684f202229ba9031fd327f9aa91c2c84a9f7c07e3bec4e3a4ec85d736a0e31
font_02_sfnt_off00014c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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