Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f5027292b955bd…

MALICIOUS

PDF

62.6 KB Created: 2021-05-27 20:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97f8c8e0102aff5850137114a2921ff9 SHA-1: e1ba1d5487a82a9b176d549a14ef8ab25a1aab0a SHA-256: c1f5027292b955bdb49aee3752783a0ac3e9b5cc19c7e640bf35b8a0c7aa8f07
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to academic theory.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9579

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://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/f38ba60d773a806ba63059b8ed4a928d/kotosurugileli.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608688445c94d---43258159204.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609233fe64b0c---zipafijaw.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c8d41a58090eb5e8abc3b614cfcfdf40/lajidixo.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/d2c4b52164f16653ead1d5cc3bd338b5/27971976771.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/70ln3d0olj5h8fuskpsfjsud5f/bomired.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609861981b309---91279427975.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/c2d97ebf37431178d9366b9e683a04e9/godev.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/752d933cae128dcb1b397724981b943f/sewurujeranim.pdf
    • https://mmszke.hu/files/file/gidopanoveretafokidumo.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/7i43leuj5kq6eeu060n3lnd7sc/39347794422.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609669a3ae1c9---8790945927.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/m0hldhoedomai78vmcqt37q7tk/80409940239.pdf
    • https://atlastoursntravels.com/userfiles/file/povegijof.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/c906c05024440952029883e92ff33cdf/xupolozupaxadalos.pdf
    • http://lorichphoto.com/pictures/file/xefogav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=teoryang+historikal+kahulugan+at+halimbawa
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d815.bin
9e91590ae502ff902ba306624a00c8d44396a7ee9717b1bfa1717db63fe08483		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD815 6416 bytes
font_01_sfnt_off0000e7e8.bin
cc8a6ca1f66014efee39a3d0fd354b756d3fc6f5829a40ad9e10eab623f176cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 5444 bytes

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