Malicious PDF — malware analysis report

Static analysis result for SHA-256 704683e82b92edb9…

MALICIOUS

PDF

83.4 KB Created: 2021-09-10 12:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5f648d031154776603146b0a9e308dec SHA-1: 406634f665752981e58fc9c82b4e829df24f2543 SHA-256: 704683e82b92edb9155406c36719c6aa5c0081a8e05bdc7e221bd01bd3dd2e6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous disposable hosting sites, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and a link farm suggests the file is intended to redirect users to malicious content, likely for credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://prodottoitalia.eu/userfiles/files/58191517532.pdf In PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/27002652239.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109051608069697.pdfIn PDF document text
    • https://kueapem.com/contents/files/41394459785.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613272ccad7b5---32610468741.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/81297252834.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210905file///50576276490.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/83649895997.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109100337274054.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/jibufo.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/8421900694.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/donogoz.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/48519003355.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/35100027435.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/27872541503.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/85816697707.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vikirubavex.pdfIn PDF document text
    • http://jaatkinson.com/userimages/desazuseke.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/fidupev.pdfIn PDF document text
    • http://ebus.cn/up_file/file/mabevipiroxepawafog.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/jofat.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613431897b4d2---21985039231.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abf43ad431---pedenulosisuwow.pdfIn PDF document text
    • https://jss-moms.si/upload/File/reverebajexatede.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/jasotoleboxefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ipad+pro+2020+pakistanPDF 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_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 19224 bytes
SHA-256: db308146a30c272ca9b21b2926ad2d249d50de8dd471279eae34e48cad0e63e1
font_02_sfnt_off000127a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A4 10492 bytes
SHA-256: 5649706287b87b111b6f1921d95db327e60590359a0e4983bcac18b8de08a6c7

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