Malicious PDF — malware analysis report

Static analysis result for SHA-256 72cfd66eb021ce33…

MALICIOUS

PDF

69.8 KB Created: 2021-07-25 05:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 05b698d07d5987d8836d50cfd25f995c SHA-1: 3f9faec2a56b9e6b3ec0ab97cffa858668cd0117 SHA-256: 72cfd66eb021ce33f372523e9e161e704713e02fdf855206be00a5d706eb902d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, and the document body was unreadable, but the presence of a link farm on compromised infrastructure is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9472

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://strahovka66.ru/userfiles/file/nofenekalitematujukujikaz.pdf In PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/9bb295141f3ca7a39e9ab308e8bdbbd7/mekipifezidebamoxaw.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/71504743026.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/64979508576.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/44op6qc44nc955iolm99qpu1bp/46545725942.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/18990208056.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/354eb4573179bdbde4da2d960223580b/jalobofanebagaforamofofid.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986788bc48c---90819791271.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160883250ee73a---13199883750.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/rusobeg.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/19368042992.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/53908386044.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/lsniqb4kh4qoagq19b2ugrls34/zuwuk.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cfd6d9cb7---2981372628.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/mifaput.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/87364229925.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/56594910909.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/vimezajumul.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/85261786206.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/baramofuzazupago.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26c44577d6---lekuvuturesonopo.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a20e477a52b---repowosaw.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe5b00d431---4211594886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=twilight+series+download+in+hindi+720pPDF 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_off0000cbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDB 16644 bytes
SHA-256: 4be1ab6eb4ab577d4d473dac5b91aaa4c69c7ee8691a295deaee149a5ed7c4ad
font_01_sfnt_off0000f75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 11012 bytes
SHA-256: 54f5bc866e5ebc411799b7310c6420f939a48521f5a572e821824132f9ef6172