Malicious PDF — malware analysis report

Static analysis result for SHA-256 23bbee3c08a3f9b5…

MALICIOUS

PDF

97.2 KB Created: 2021-10-09 23:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f357a176ffb8a648bb45ee05205cda39 SHA-1: face33efe507cc2b993e9b38994c962eb3d973d1 SHA-256: 23bbee3c08a3f9b52dae1f0466452257e03a637db5389f630e05af9d59321e57
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and a link farm on disposable hosting supports the classification as a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://huntic.ru/uplcv?utm_term=abnormal+outpouchings+in+the+intestinal+wall PDF link annotation
    • http://gyn-ordi.at/myPix/file/gewuw.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16327002741257.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219221634157657.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/xelumumoxakupudil.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/kasok.pdfIn PDF document text
    • https://myoffice.acqualive.com/uploads/files/3076674677.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/loxezup.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/liwefozanelomibovatarife.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16156773adb477---30676546901.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/fulil.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/dikituwuru.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159a5c6bf837---nifumazofubaje.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/vuvaxojebudi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/85mst1qonl6bgq7t8906lhuole/jovaguretasasavuvawuluma.pdfIn PDF document text
    • http://terminsk.by/pics/files/fijanono.pdfIn PDF document text
    • http://pileki.com/imgup/file/67838537426.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/440e7b1f0f92d2bee7ae8ce5b1ba2f07/zofimezota.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210920015153.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/zamenefibewogepuwununibit.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/rorirarutigamedokaj.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20211008033410_6rvmmh.pdfIn PDF document text
    • https://slavyansk.biz/userfiles/file/xegitefodiwena.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/270804406.pdfIn PDF document text
    • 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_off00010fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E2 20588 bytes
SHA-256: f2ce85207d32b352ac34574a23111483d96a1113f5645535379582df1d85521f
font_02_sfnt_off00015d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D24 11128 bytes
SHA-256: 1c8cfb4d9fad896e7aebe1cdabf5c9ac3f1930386c419dcd9151883281a0a156

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