Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4349a081d2e43c…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 15:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e84d5f27aa87ca3ffe7eeea5b266468 SHA-1: 0c7c852a2c4915ae1b9461b509afa59050b1d275 SHA-256: 8c4349a081d2e43cd6b68e597d23a5c7a6b4c405dab184fd058b47137201537e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which are identified as part of a link farm. Heuristics indicate these links are likely intended to direct users to compromised or disposable hosting sites. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with phishing or malware delivery via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://accuratesearch.com/userfiles/file/sinatejek.pdf In PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/mibuzigozinas.pdfIn PDF document text
    • http://strandedtattoo.net/file/65430657492.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/dumexa.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/63939039866.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/powowoxeduloxafagelagiguk.pdfIn PDF document text
    • https://mfdesign.hu/files/file/vinamefoxol.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/4327225848.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/kobixowinejerakiwizinefu.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fff74ef33---42075877260.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff637b962d---72839982262.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/36604156138.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/20071431524.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/9db3ee64de64d196265da31a6fe0757f/gugononaxored.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/jofenanalomem.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/zorawidorelux.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/lodubazafufomuzovuxidutu.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abd5f7ce4e---wosovabovegerolonebipi.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a427964cc3---velukenisizerigodimire.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/24423389301.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/70267000875.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b7aebdae---88385172426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=howards+end+pdf+espa%C3%B1olPDF 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_off0000dc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 19408 bytes
SHA-256: 2e8caff82f87e3ea1b0ec6c151278699a3971177aaf4955385629a06b0c8e345
font_01_sfnt_off00010e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12682 10584 bytes
SHA-256: 8a416e5fa68c2f4510401472d0fd87422319b263400e4c94b9bfa122a7e0cf01

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