Malicious PDF — malware analysis report

Static analysis result for SHA-256 a768e043695cdf3a…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 22:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d73f103cbe110a7a2312ba598cd8f2d1 SHA-1: 13db5c57ec999cc068dd83ccb5fbc39c235655a2 SHA-256: a768e043695cdf3a93e1d14f92e37bccc891a864430207b646c25060f6d95486
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to download files. The presence of a URL with 'bliss+os+x64+download' in its query parameters further supports the lure of downloading software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://hcbarrett.com/user_area/file/41909272412.pdf In PDF document text
    • http://datacomsystems.cz/userfiles/file/39277389845.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137dfc189971---37606551115.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3bb29b2d7---67406164241.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/lazuw.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/zuvoxajovetixejaruwa.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/remavesifakim.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/lofav.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/dewer.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/82723531020.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xowonobugizesixofivin.pdfIn PDF document text
    • http://effektfilm.de/files/file/22649186205.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613352759e105---59197892991.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/18/file/20210918_123209_120.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/26477451671.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a90e24d7c---xurovep.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142323561ece---jepatupidosubulo.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/lodubodovotureg.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/fodagubonizimatidu.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/65821828804.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/gotivinigamup.pdfIn PDF document text
    • http://edeins.com/userfiles/file/42733568739.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/54711419844.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xutaxajisapalunagididem.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344c0fdbe4e---67330837277.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/83230226424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=bliss+os+x64+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_off0000cfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA1 17724 bytes
SHA-256: 2f0a929bb74ed5e9a6b800b3f3c949d86225dd2d19c58fa2a12c8516106ffb47
font_01_sfnt_off0000fd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD85 10400 bytes
SHA-256: 85af0f0554a079041421b774751ba3af4f5a223facb432fd0e872190b074ca04
font_02_sfnt_off0001154e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1