Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1a8bb6d24e57c0…

MALICIOUS

PDF

84.0 KB Created: 2021-07-13 13:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 100ce2aa156e6afa1defa033fd0ab4ae SHA-1: 9437e8f3d18ad7d1bea55777221ec9d35d51005d SHA-256: cc1a8bb6d24e57c0be18e178a1bf0f7bac4e8dcae308423d3de61962990aac75
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting malicious files. This suggests the PDF is designed to lure users to these sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6978

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/09893e4c2c2e4c0eb3df895008d6aefc/89678371941.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e899bc7e4---wuzegu.pdf
    • https://isosklo.cz./uploads/nikos.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210606065037868871pi49eg.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/ddb32c39f4113cb18a0131455ae3253d/ribunerulodetaveduzote.pdf
    • https://pendekaremas.com/contents//files/jajugapexegiwibo.pdf
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbdbe270e7---61259025026.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/64eb475e1bc674960918daa539805ddf/86406935695.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a33fd4ee5bf---30406650775.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/e2pjdd313s5i5vnl41kodlskok/demakikuped.pdf
    • http://myarrahnu.com/mo_images/files/49159263586.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/cc0cfcad0e8396fb5e6016b4ab8d73df/bixomumomutusigadi.pdf
    • https://nisahanpin.com/calisma2/files/uploads/32740866203.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/478c8acfc8c0cffc934ba634fcac9089/puvamedekumopafidi.pdf
    • http://thebrownbag.vn/upload/files/sevigewizijubazi.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/1be739e3d046749b4a6a9e3a835239e5/77836761413.pdf
    • http://4x4autok.hu/userfiles/files/38625435269.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=bpd+intrusive+thoughts
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001207c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1207C 16792 bytes
font_01_sfnt_off00013893.bin
d676878cab50aac012760db3411094b324e8c0a13d3965f960ac277d3cba2833		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13893 10684 bytes

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