Malicious PDF — malware analysis report

Static analysis result for SHA-256 2232270d1fdd5f79…

MALICIOUS

PDF

91.9 KB Created: 2021-09-03 06:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8a0ade32db95105a883a765035bd4d70 SHA-1: e09c66ee5942723e16fed7d822e2ed4306d59cb3 SHA-256: 2232270d1fdd5f796955f9ffbc1290065fc7461c18a91b3e4f7e2be98239d396
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the nature of the URLs and the heuristic firings suggest an attempt to lure users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/eeeb7d786cebc4198ee2ebfc39b76c82/59543014313.pdf In PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/86beaf03810923a803c0bec68d3b5f9b/ribivi.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/10113755546.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/bfe6737943c10674a03a45a68253cf7b/nizaze.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075148a9aed7---44604043903.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/0e9870cc9f88a6a39f0f858cceee8d1b/69532815137.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/33914140499.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/90682191623.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/70cb5bf01fb7989692ae72ec5682cb0f/57372329524.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/tutunawob.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ef4fbfbd9---81397587503.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3c558f99---61547627024.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160daccd39cb60---pazepubup.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/47619912850.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/42602255913.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/33464397980.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/74519739779.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/9131264209.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6dfcf1ca5---79566724912.pdfIn PDF document text
    • https://alpinashop.bg/files/melekulakumogapaxemipefuj.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/50980978861.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/16359043526.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/siludomixewalemiz.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b25d03ac703---58638465949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ramadan+2019+calendar+cape+town+pdfPDF 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_off0000f206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A18 23104 bytes
SHA-256: 2bf9f14dbd4f7541d5ce0f7b91663df606b93e7f00f2caeeca35197c4beb110a
font_02_sfnt_off0001454d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454D 11116 bytes
SHA-256: ddd40cefb403802e44f2af8170e2ea7d88691e5408188a3aa8fb4de3d1faaeda

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