Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3443f13a535a2b…

MALICIOUS

PDF

78.3 KB Created: 2021-09-04 15:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b9f5e25823283b6af2d28d31252441b SHA-1: 82b546d4b4574719c5f7386e4829c4da7f6620e1 SHA-256: 4d3443f13a535a2bbfe8f583875a5d8658353d23308539230a7acf4c3b4bff4d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites hosting other PDF files. This pattern suggests a link farm designed to distribute malicious content, likely phishing lures or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary attack pattern being the distribution of further malicious documents via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c437f2978---67520163322.pdf In PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/84620436979.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/daussso2q4m4846nu23nc9uss9/rafalidanatiz.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cfda95107---6124700267.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/ropilos.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/92790345861.pdfIn PDF document text
    • http://biosite.ru/images/news/file/vopunugepu.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/26021049855.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/nevadowojusowonakoxana.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/62768298169.pdfIn PDF document text
    • https://limsurdua.com/contents//files/63910324309.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/fugiwazowixiwuv.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/90887431213.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/4564bbc0f59b8effd70b98986d07d6d8/kitosowalasigax.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/wemulepopuvimogomaravedi.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/zeveremupakewewazepovu.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/60fc4152b4edddf20fc83e78ed755e92/mudujuxezevaweterijuj.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094a6d79f4d6---24559142716.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16113c83b240f6---27219276326.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/7fe850b40109ca73a9ffa8fb4700e4c8/37859927423.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca4b806b26---lotomanuxusufopoda.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/44052167858.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/0c7d844174c0a3f1f3b1a118e7603d6a/mafokoro.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210705_204512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=alpha+dhyanam+tamil+pdf+free+downloadPDF 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_off0000c1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B3 10776 bytes
SHA-256: a378e01f47d0f5c181cc20f5a1bcd796f5c24ca185d0810c2080212307a9bf33
font_01_sfnt_off0000da5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 22532 bytes
SHA-256: a78a2a7756dd40f1d947db9161a6b354311e6e68c5a224fb6e84c62dc304c5e1

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