Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fcb5e347548de7…

MALICIOUS

PDF

87.0 KB Created: 2021-06-12 06:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e5f1903560456476e0a967a12165af3b SHA-1: 35800d68ae3402f470737edce5a47e2a0a115eea SHA-256: d5fcb5e347548de7ab6b2e6cc2a9151207f668268e11ae6ed990e0a5292a0ebd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, pointing to compromised websites and disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8007

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 https://pixomot.ru/uplcv?utm_term=states+of+matter+practice+worksheet+pdf PDF link annotation
    • https://amatnieks.com/pictures/image/28355107908.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/kotowumi.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/35530941014.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7828d6a56e1be3487e334d6c425dc200/56765457229.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/478c2a8600cd6aa0f5fa707eded47c9f/94761206121.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/qktlj57ptfp71ij6h6joqh4g32/43608458328.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ef2gmu0bo188f04e0kais724l2/varax.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/d2l3369lv6hmj6vu535guededt/98381213407.pdfIn PDF document text
    • https://arerp.kr/data/file/%5C/69849179615.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/57639925146.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/zipegavo.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c012bc680a5---14185846165.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160945998b16ed---mavezukitedumidewifilif.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/81886521780.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16087004da6af8---38465348716.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D1 3300 bytes
SHA-256: 83d03a551903e582702261a6ce2dacfc2bdffa353db6a2974bbe72783253901c
font_01_sfnt_off00013275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13275 5620 bytes
SHA-256: 67e3ddde8b1ed93a0ba46792fe385e51837bc752b74925aa170a311b04ab8d59
font_02_sfnt_off00014574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14574 2128 bytes
SHA-256: 0a73d8a25156785139a078855830d30fa55b6dab5e1ac7fcdd83e64803521e65

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