Malicious PDF — malware analysis report

Static analysis result for SHA-256 96263e07877b19e0…

MALICIOUS

PDF

81.8 KB Created: 2021-07-20 14:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9e0a8d806c470592658bc1b358b19a5 SHA-1: 38ddec1e97a81eb044c43168e2b35b6dc1336b76 SHA-256: 96263e07877b19e03ff37cad237335da613372548998d26e225e27f8aa639262
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The embedded JavaScript likely serves to obfuscate the malicious intent or facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vtvxm.vn/userfiles/file/2348276569.pdf In PDF document text
    • https://topclassgardening.nl/images/file/8960427397.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/31122360469.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210716033416392.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/sumakebuwavu.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/begokefozodax.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/41530319412.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072ddbf89f13---82460460537.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a57525d5c6---81382699606.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/ad589e375c53f7d98f7598b281e9c66b/bigafodud.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/7kaj3pqmpc0dq7mgq0ou6p26h0/42024803913.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b46a82426b2---zenitizovukitadofisole.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/71155440043.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607633cdd7add---81241742857.pdfIn PDF document text
    • https://togeltop.net/contents//files/67594589292.pdfIn PDF document text
    • https://horticulturenepal.org/userfiles/file/ramabajuvixelewete.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bae5b6eae---sarodafugina.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/wokejivabube.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/zejufego.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/87225858890.pdfIn PDF document text
    • http://wych123.com/upload/files/zemurukigoruwag.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/65282297393.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f0252f320---wasat.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bp3nlou66fv1s3ims0voftkne4/magekurinozofexor.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/59619135340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+increase+body+strengthPDF 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_off0000f6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A7 10936 bytes
SHA-256: 4d802e657983112f49731c600892d546585f5d6d23a7998692de2fe5b5e40df0
font_01_sfnt_off00010fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC7 16912 bytes
SHA-256: 7dcdf23f89804e8c19e97affd1ecc7d3f59c15fc915c919b26d98feb1e3babc9