Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb88ac1cf101f38b…

MALICIOUS

PDF

85.2 KB Created: 2021-08-15 02:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 9053f31a03dbc93ff719fc550c71538d SHA-1: 51749765bb05723a4695b95085f2dd43573d79a5 SHA-256: bb88ac1cf101f38b973acc3c5d3bbd1b07ad8cfbeced5d2db461951769f68f76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • 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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9621d09f2218c7159064839736cb7396/laled.pdf In PDF document text
    • http://jorkurojus.com/userfiles/file/29930071756.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/20641327343.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/fezezikegijovegofo.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/robumosekok.pdfIn PDF document text
    • https://www.utn.ac.cr//sites/default/files/files/24720421442.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/47507486368.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/bedeverubogideza.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/xamagobipepotinobure.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/70942207368.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/67319807826.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/nikirewi.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160741b377e8f5---pezenageve.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/59244507109.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/49244142460fa088e483f8.pdfIn PDF document text
    • http://agavietnam.com/img/files/99801181103.pdfIn PDF document text
    • http://stevis.cz/files/file/botasidogebati.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d27006513a---72433369093.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/69168061732.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/lutajomonovufamoke.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160859c916db84---komosarivuxe.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/aa190c2729eae4ab43e027fbfcf41fb3/foniditexazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=%C3%B6znur+y%C4%B1ld%C4%B1r%C4%B1m+yabanc%C4%B1+pdf+indirPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD082 10848 bytes
SHA-256: f491ddd07daf54514b5017aa0fe7761016d2ba1fdcd013ce8ade53e17c538b8f
font_01_sfnt_off0000e923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 18260 bytes
SHA-256: ff910cea180026b5067e3e1f50ba1f6d8ffbfc22b2c92bb821d92d6f5a914dce
font_02_sfnt_off0001152b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152B 16504 bytes
SHA-256: ecb6dcd076c6ec86f709ddfabf3a5e6be7fe50d21400409b1d34eb3b1363b2ee
font_03_sfnt_off00012bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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