Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb9a4ab52b2c2d3…

MALICIOUS

PDF

82.9 KB Created: 2021-06-24 10:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dd0682eb2fce5cb28a8b81824729bf4 SHA-1: b4260ccf74af4d74bf8362b893524c5bfdd7f89a SHA-256: bdb9a4ab52b2c2d30c08eca05aec7edcb081dc01bdddd756db43c1bc25466e49
94 Risk Score

Malware Insights

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

The PDF document uses a lure of 'Headway intermediate workbook answer key' to entice users to click on embedded links. These links form a link farm, with many pointing to compromised WordPress sites and disposable hosting domains, suggesting an attempt to distribute further malicious content or phish for credentials. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9420

Heuristics 4

  • 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
  • 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://pixomot.ru/uplcv?utm_term=headway+intermediate+workbook+answer+key+fourth+edition
    • http://yishiweb.com/upfiles/files/20210616_224632.pdf
    • http://dralituncer.net/userfiles/file/11260490600.pdf
    • http://temple.mo/userfiles/file/danegosifowe.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607865c4dc213---daxelowexe.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b03512eb752---legimizufawenefu.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4be711b8e---38069036659.pdf
    • https://vandolderskb.com/images/usr/sogulozebanaxivijulatuxa.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/7715daa610a7872770370668e89be3f7/nadalavanalarozakov.pdf
    • http://mwflower.com/upimagesfile/%5C/36745799810.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/e4de5b7a35fd3e0d083cd280bdd82ffb/6543908515.pdf
    • http://archimax.ch/dynamic-images/cms/file/31906161089.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3af98a09c---kabijofe.pdf
    • http://auto-spec.ca/fck/file/ravemepuwagodumigawizo.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c21c881636---76852195003.pdf
    • http://aarogyamedico.com/userfiles/file/vunofaxelekoniwujuderabol.pdf
    • http://automotiveenergy.cz/userfiles/file/63016258826.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e247.bin
05a6f1f870c55f4cdaf2a11a575834d8284c8feb9153d18a4b25b0b3446b0fcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE247 3620 bytes
font_01_sfnt_off0000eef0.bin
0cb37a0cdd2a991057cf09d61a535880255505e24d626d63917f320f3f1a8b94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 5472 bytes
font_02_sfnt_off00010175.bin
ec8cf0b676aaab1828e055523b679d89d27dbc83386e4b8c17a57f29868214b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10175 16904 bytes
font_03_sfnt_off0001331c.bin
e94d9fa8b23aa0827f5bd97b41e450e4c70ec8cd881880446398b13205f313c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1331C 16156 bytes

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