Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d15b28df2a214d…

MALICIOUS

PDF

68.6 KB Created: 2021-09-26 09:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 94a2f6260149aaa1d11ae564caae32b5 SHA-1: edcaa1c1abfdd9889738ba748068012ac82c54ce SHA-256: 22d15b28df2a214d90453204204e2396ffd65fb9644460b50fbafefc063f2cd3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot used to hide clickable links. Multiple heuristics indicate it functions as a link farm, pointing to various compromised CMS uploads and disposable hosting sites. While no scripts were directly extracted, the presence of external URIs and the overall structure strongly suggest the intent is to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://abwmountvernon.com/uploads/files/gizonutaluzimijime.pdf In PDF document text
    • http://cocoon-source-harmonie.fr/public/file/53235701599.pdfIn PDF document text
    • http://fructusartis.com/i/File/67842159963.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141125e03719---tufid.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631949058_6dd0e781a8.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/28061433474.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/mavakuxalabapo.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/8071476315.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/80310656619.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/motujosezitigepaxa.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/3124bfad7284a674eeccd24ba370a5c0/55694493763.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/38938789390.pdfIn PDF document text
    • http://kco.su/userfiles/file/nekewaxiradapor.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/36330115347.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/57340665384.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3b904b84145f23c456a16b664d5b607/70453851046.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021090612314570554.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/40999595838.pdfIn PDF document text
    • http://partnercable.com/files/81880580287.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021092614540412.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/75516671024.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/34892694558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=one+punch+mod+apkPDF 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_off0000b11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11D 14328 bytes
SHA-256: 78baf93778d9c82afe6ceefb621c52d174e3dae2ecc2eaedc6c3c192e9d83972
font_01_sfnt_off0000d4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F3 10492 bytes
SHA-256: 7c78b194705872e502f3c5b3eb1a4b8fc92b5620da433a1ab16ca10402e72584
font_02_sfnt_off0000ec9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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