Malicious PDF — malware analysis report

Static analysis result for SHA-256 24af0c6f842f4278…

MALICIOUS

PDF

88.5 KB Created: 2021-08-09 07:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3805cbc181bd6c1f7931dc6868fffa9e SHA-1: e4357c805fd60f7e14dfe114a88b1e22b1cb94e1 SHA-256: 24af0c6f842f42785c20ee859d9886eac18cbfebd60a4eaaead53a7d1027d265
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing pages or download further malware. The presence of multiple external URIs and link farm heuristics confirms the document's primary function is to act as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://blueyee.com/upload/file/211451453281.pdf In PDF document text
    • http://shipagents.nl/uploadfiles/file/14706631730.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607426768ef42---nolorigij.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9f1fdfd09---sagoxem.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/656fdcec97144977da9ec274211b13ac/61818849410.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/tijapewere.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/dodabosubibokilixed.pdfIn PDF document text
    • http://tumonjfk2020reunion.org/clients/f/fe/fe8b949e9fe7e5065ccade199761aacb/File/44732017165.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/86365605055.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/popetuposulu.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/vidimapibamu.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/vumafex.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16086471089fe1---buvomasatubinag.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609da9dd76527---bumifarudufobonanal.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/wizezojuviritemikivowo.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/12577322165.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/5548075563.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a1ff0af0e---75435451434.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/70076277368.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/nusixapoluvoken.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/89366587917.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/58495595591.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/38820477144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=wavepad+sound+editor+freewarePDF 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_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCC 10688 bytes
SHA-256: c34d5cf9250757c434304c9058fd363aaab71ea35cec6084943255d7a4ebdaad
font_02_sfnt_off0001257d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257D 17444 bytes
SHA-256: fcd2402667754e0bdd40639ce71034469d2413f54d06b8e868332684f4fa3eaf

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