Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f02dcca3589cc0…

MALICIOUS

PDF

74.0 KB Created: 2021-09-06 01:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 127188259fb1f767f24f9865db94a946 SHA-1: a0f58becce8736cf4ee4aa79ba0da6179b2501dd SHA-256: f5f02dcca3589cc02a62486c15a1ee85a31d8bbe7ec6e25a4ca98e5f70242cda
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, many hosted on compromised or disposable domains. The presence of 'utm_term' parameters suggests a potential SEO manipulation or phishing lure to drive traffic to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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
  • 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://dla-pracownika.pl/pliki_user/File/33473600751.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/lm7s1i786qq30m3i6c77og658g/69579164239.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/dobumo.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/57847087519.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098018b94b8f---golududedokizijefixexoso.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7412e186---39505595620.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/80821459701.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/b5a883430860f3a47c096803c3083fe6/2991890490.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/90c027a05a20a3926b027fa09018291a/90692081942.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097acc06ef2d---39501093682.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/16172847424.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/2149207759.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///12630848061.pdfIn PDF document text
    • http://belst.by/upload/file/82939560988.pdfIn PDF document text
    • http://ucokampen.com/media/files/86059399288.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/78965059764.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/16152766337.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/vekifimigegapinojazupopi.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/15b118e4bb2c26362dd8a10050a21217/dupixizuwijajufewolegovi.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/6725528180.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/40669661926.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202108/file/beredesezipevapefo.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc58cb142---75998564159.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/59573646080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=finite+element+analysis+pdf+downloadPDF 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_off0000bec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 10736 bytes
SHA-256: 1c0a06cd09dc11321938bae431b01b29ed5cde08612020b0de282ab5bfa6ee2d
font_02_sfnt_off0000ef91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF91 16808 bytes
SHA-256: c07027f8fcb526bf9d0fd154d93869a826a738ba559385a893ebb194de6ca975