Malicious PDF — malware analysis report

Static analysis result for SHA-256 32cf053e752ded3f…

MALICIOUS

PDF

82.7 KB Created: 2021-08-25 12:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ad198170355012553177cb9b1aba28b6 SHA-1: d687f70672d429a8a964fe587f1be980172a294d SHA-256: 32cf053e752ded3ffddb8101dec7891a006cbe04318559f8deb89bbe97796652
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content or facilitate phishing. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/566bba906ce68e0a90021378ccd32b44/lewexupupuduzijuzemepoma.pdf In PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608899b89bcad---55796935461.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608118e206037---60936522084.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/7au8ujap6o5o8o8ej9krmviiv9/76328843193.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b0de07c6f33---doresimusifasawon.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/topotozoduxunajurejuvajo.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/69716849474.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccfeb1fdd9---2478982859.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607521acd28e8---64008516709.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/29106980346.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/oafcs1qrpnu7b1p9vsvk4bsjaq/63102403019.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/84502488051.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/pudowitudiluda.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c70ee8089bd---tadagupixaxab.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/56665925408.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/rasosopepamepetorosedemu.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/resenagobakirak.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/23059770337.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/0c2ec8a9ed86447a72b873db3df0a706/381679883.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/xezoxubosuxibesijin.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/16402120594.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/tegizukubuzolub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=best+royal+giant+deckPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000df08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71F 10804 bytes
SHA-256: c175d9cd01679f4b1a3f87cc731f7a299a9eaef425d35af41f4bf92cb544e33d
font_02_sfnt_off00010ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFD 17104 bytes
SHA-256: 8b471d49dbce75be8be7d53cf705ced7cc4e384b9387c132d6e023d9a8f73115

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