Malicious PDF — malware analysis report

Static analysis result for SHA-256 2375aa741d10adc4…

MALICIOUS

PDF

71.3 KB Created: 2021-09-06 23:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b76a6eb96f125dcae0d5995480a6919 SHA-1: e5718876961765335af963c2e7ac73a2eacfa4dc SHA-256: 2375aa741d10adc4b3679d3f33fe7294b421bc8384cb33e6d4b7eee1ff24ca60
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics identified it as a link farm pointing to compromised websites, suggesting a phishing or malware distribution scheme. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=cajon+lessons+pdf PDF link annotation
    • http://boeschfamilytravels.com/clients/43210/File/watazubozovipefesobe.pdfIn PDF document text
    • https://khanikango.in/file/32779324372.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc28a25b83---35927935153.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/86019818369.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/lezudibegazofexa.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/faxijomewubi.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062304424387.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/9248204416.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/pomezizukoxiboduzag.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/vatagogesedebaf.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/a2qq5kqp5dksmkbj4pel684ni6/lapupe.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/b1d856345ea21ca96539b03e8cec03cc/nuxododekatoni.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9dd792e3f---27922172352.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/78636744709.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f80f79ca6b---90344660010.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/wejipeluvafi.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d5c17978---43560686405.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/cee42ed41ff846879487c25a57907339/lobimevuroro.pdfIn PDF document text
    • http://videocycling.info/files/file/14917823620.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/meluketotutivanebiladazo.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160720b9bd451f---serufajisufifuvowonomu.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-10/20210510085110241608.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_off0000b86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86D 16032 bytes
SHA-256: 4ee3d34bb751cbd82c9e0cfb3adc84af664520ff5a680fc051e27f397ee50fa3
font_01_sfnt_off0000e07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07E 10360 bytes
SHA-256: 928e5ad42ba533244068ee5c1cc3032c03aae3436648cbb1bd3013ef21fff571
font_02_sfnt_off0000f812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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