Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf813fb3e68717f4…

MALICIOUS

PDF

84.8 KB Created: 2021-08-04 03:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8851d3494ab7dc2f3b743ea30b6b36f7 SHA-1: 929378c15e093fefc766aff8736879a4291ebb09 SHA-256: bf813fb3e68717f4bf9dd39c399e17f2f557f80a71d03466be2c234b924f1607
154 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it's designed to lure users to malicious content. The presence of external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5017

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://finatwork.com/userfiles/file/xadowezibatazoke.pdf In PDF document text
    • https://laetitiabernard.fr/images/file/98818158081.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/42098621810.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607776930c2a1---67096301315.pdfIn PDF document text
    • http://caf-ljubljana.si/docs/55623989018.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/46373805120.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbf818603---72512797501.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/dfmg2jp24kpiiqe19ohnpjbgmu/98130229586.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/xijutazemikeborejup.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f73f42653---molunifipo.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/jigubujenediguvorinu.pdfIn PDF document text
    • http://usateatop.com/_upload/files/48765577505.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/jakaxojujixegup.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b46ba2eb8---zuwanoxuvuminomifires.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/15001680764.pdfIn PDF document text
    • https://baongochoa.com/upload/file/pajifoxeduwosorixun.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/9f0dd2d1658231bec3018bbb61209020/15073376131.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5d80dc037---76608895730.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/22925806635.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/zitakavop.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160856d01e97fe---21933036625.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8724841f9f---tebura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=t%E1%BA%A3i+avast+premier+2019+full+crackPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C0 30064 bytes
SHA-256: 36e33c710b01b26b5de1bc8128995237dcb22f4d7665144799e1a45c8e55e1a1
font_01_sfnt_off00012d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D76 11336 bytes
SHA-256: fa95cc36f27cf50229a4fea895f282a3c4de250e221ebc6012dd355918a4a8d9

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