Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33ce673aa5450a6…

MALICIOUS

PDF

77.7 KB Created: 2021-08-06 02:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 738ec9937486f051a379fed601a09d34 SHA-1: 017b8846187262f2049a89e911eda0c4eda59609 SHA-256: a33ce673aa5450a60f3c2354741f0514c065e61cac2b06c6059056376a1f51ca
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2949

Heuristics 5

  • 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
  • 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://schule.havonix.com/ckfinder/userfiles/files/xowojesukip.pdf In PDF document text
    • http://parentini.it/userfiles/files/48988858918.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/t0dnugnp5856qg020kaptbbpkt/revisivefuvizofividus.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/92391459020.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3e97c2367---mimul.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/31241070224.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/radowusaj.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/02180b9000cb3cdd7111423dafbd9719/33337401432.pdfIn PDF document text
    • http://st03.it/userfiles/files/98016987042.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a005961fe74---84177121771.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/90680592523.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/1181c375ca113b99a5217449fcb17e43/65049632091.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff5500e7c7---78824397594.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/bagatovinetesi.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/31553115417.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722a9cb55d9---10658470033.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/siborizulideperomumawulex.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/o9lldhgooo54ab5gscj35stm66/97162282218.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/5h6n6ufo2s3m4962ddhivqpgi4/40089782606.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/8689852146.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/3a4894521627349b4394e24121f28405/ligunitubasogo.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/6ejq67qf7fa12o6vspn2d7649s/kopilez.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/bavurinobu.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/dbcf7d101541ca8509b16e0a685e807c/1820374668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=bio+data+format+for+marriage+in+marathi+pdfPDF link annotation
    • 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_off0000d6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 10784 bytes
SHA-256: b34a8b3575136e8cec64d95e79443b20d9a097fb1bab9e068a6f740142d7de60
font_01_sfnt_off0000ef24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 16280 bytes
SHA-256: 2961ca527ff534757367497e697e262caa1710525c8446aa2509867b6288b97a
font_02_sfnt_off00011941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1