Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77c2919ac7e78b1…

MALICIOUS

PDF

70.7 KB Created: 2021-05-10 13:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26d5305833c51702dfcf2e68d49d3dfa SHA-1: 2c12cce5a7cebbaea3acdfbb9e0f12046459525b SHA-256: e77c2919ac7e78b154e1dd2429ebed4efb6819b3bed4c1042ab36834223b8795
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 ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of external URIs and link farm heuristics strongly points to an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8438

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://synerhu.ru/uplcv?utm_term=rssb+shabad+2017
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/67ce4d09ca2f2ff09a1c36d3aba368cf/miwasumosuduvev.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4a1db6328---roliwiterewido.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608731039cb90---wivobisojaj.pdf
    • http://nitexprofi.cz/userfiles/file/59075714675.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e03248f2653fa2e20fdd25f40641627f/raxigol.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160715e6164e72---tupoduzev.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3215024c---77508969039.pdf
    • http://rolmech-strzelno.pl/Upload/file/zegof.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609000903ae1a---69478131548.pdf
    • http://elsekmont.eu/userfiles/file/34763647404.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160947726d204c---3146357042.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607a19eaac372---karikeboxunodigiz.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/70e202294dc1a75591b09d18aa87aba3/sorobovegaxiw.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f973e54216---48043191721.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d573.bin
e665ef516937a3ef005b42edeefd35185eb8e3464bc7c56482eb0227746da474		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD573 5336 bytes
font_01_sfnt_off0000e799.bin
d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE799 3720 bytes
font_02_sfnt_off0000f2fc.bin
25293dbe6072cc95890b955294149d464ba095e7de098bc26b840375d0a2f032		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 11012 bytes

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