Malicious PDF — malware analysis report

Static analysis result for SHA-256 71deff6ea93d4dde…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 00:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3324ff865a9e3cdb6d659a35513029c4 SHA-1: 4acaafe419111653742bbb96a06f16f7f87be41d SHA-256: 71deff6ea93d4dded393333f243c26573742d8c58d93679113e76b35dab959e7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. This suggests a phishing or redirection scheme designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/83016283398.pdf In PDF document text
    • http://jfe.hk/userfiles/koxemorupenuxo.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929cf245b4b---28011253683.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/ede884ad4b66be06d6e7cfe829c1edc0/70165709735.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/53473649877.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/9121f0934930ce83a36541563daee0a7/nisuzavisekoliga.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/vosetad.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/nexasijosomefa.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/76452237409.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/f40mcl0m9gvo9n9lg0nkla372d/17823702292.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/bogofawebifowo.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/69159924436.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/20347768711.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/99755356790.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/zetopafiparenesogaboxevit.pdfIn PDF document text
    • https://hagepoorter.be/files/files/xetetufagobokewifinikip.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca3c9aae19---12761733474.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be7e8a0868e---11280541163.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/f33efb291ec74219a956a76cae196c00/10274097240.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/naxitagofarikawonanegawi.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-21/20210621120517335019.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb72f25933---8306808844.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094cbe4c2720---12138322106.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a48674221---84529502046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=electrical+engineering+project+report+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_off0000cb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE335 10740 bytes
SHA-256: d91c4d1eee10e0deaace88d867c927a0548ba1aa25f33f1e573a27f672612f33
font_02_sfnt_off0000fbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB1 17360 bytes
SHA-256: cdc3a7b8ac3cc0f9525d6631bfb60e56b4ea39cee74a853b5ce6a1111b50cf23

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