Malicious PDF — malware analysis report

Static analysis result for SHA-256 841624cffe755555…

MALICIOUS

PDF

80.4 KB Created: 2021-07-18 19:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ad59ad0c1c61102f885a77477aa1629 SHA-1: 023cc4df165b562207513aee3f9fc7c3bfb41e27 SHA-256: 841624cffe755555f5dc86822d1fc1997f47532397ca4714d1e9b1e7ef2da040
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms. The ClamAV detection and the presence of multiple links to potentially malicious or compromised sites indicate a phishing or malware distribution attempt. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4805

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://aromaonly1.com/yamituki-n/uploads/files/60598420507.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085937902a71---53257012233.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0583f7b051471172126fadd82af69d98/naxuduzovamuxafisew.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/d3d1295478db6cab01f5740d26fd43bb/menedifagijuxulusaj.pdf
    • http://cyuanmei.com/userfiles/file/zofizunumemafuxofodotoja.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/53a2966f9d3c65caa56c57d15ab7c26b/guninozaw.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/eb252db0000397e9be5284ab6bf110d3/wuwuvifesabatimikuda.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/7e1e111ac0f1e4c4810c6b1f8ed96d6b/23353897024.pdf
    • http://jvcc.cn/ckfinder/userfiles/files/210717051921784698h87ws.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4085d5f05---lelosokokorasotesi.pdf
    • http://bluecars.pl/userfiles/file/rikegijosizozivopajagasom.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/bec6r7dno82c2vlb7ets7tnq2u/18447420304.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b7aca0acb7f---91345055007.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d193a7e43c4---sesadutixi.pdf
    • http://worldnaturalfood.com/image/upload/File/81258179547.pdf
    • http://fqcycpa.com/jingkelun/userfiles/files/20210704233426.pdf
    • http://stauarchitetti.eu/userfiles/files/kubonokigijugubu.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44667da466---16356730464.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=export+compressed+video+premiere+pro
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1d0.bin
b31f6ea122da67defbd223e538c78c1c3d06407eee2da3299c47890a8edbef05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D0 17344 bytes
font_01_sfnt_off00010f19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 16792 bytes
font_02_sfnt_off00012730.bin
fb86c31b7230c9ced170d9869ee46b08f428282c8269c3ab2f87e8f75ae59177		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12730 10512 bytes

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