Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5a1d615e979b12…

MALICIOUS

PDF

73.5 KB Created: 2021-06-20 01:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 032fb76b5d95855a41621a5688b1a177 SHA-1: fa0f05c3fe8cbb1ffe29f2ad976375545dbc38ba SHA-256: df5a1d615e979b122129eed2842b2547610161df1be9d01233a5c8da3ae102ae
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains remnants of what appears to be a lure related to account termination or required action, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1d321f4e4---vigarixasoroga.pdf In PDF document text
    • http://unseenadventure.com/userfiles/file/19286532586.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/xoletudalupuvadizofepawog.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/44659280195.pdfIn PDF document text
    • https://tl-systems.hu/files/files/tojirazuwunozapojinuzit.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b10c15c9f0---58464092247.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096cf634bcd9---madagigila.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/suvinatizojelijukafefaw.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/24253622407.pdfIn PDF document text
    • https://yorapp.it/file/49940756979.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9ae76aba3---77433962956.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/1686423782.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=simple+past+speaking+exercisesPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D0 5488 bytes
SHA-256: 26798ca10857e0fd820ed9e5f6a1a1e718055ef8a413948e5428f1880487f2bc
font_01_sfnt_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 10652 bytes
SHA-256: a092d34754b708775913eacaf42fa3a95e5e874f3560c87f82b0f76774ca4eb3

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