Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6737f011f07bd13…

MALICIOUS

PDF

101.8 KB Created: 2021-09-07 23:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ebabecdfa1097e1123875c6031ea4768 SHA-1: 1f92a8a4036022ebdabca7118e26a12a8e0830bf SHA-256: e6737f011f07bd1319dda4f23b33a3c64564e59ded9036d7a9fe2e89b94ebd56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the nature of the embedded URLs and the overall detection points to a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://cyc.cz/pictures/clanky/files/7981620045.pdf In PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/69411514044.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/abf26d4143ae998fa8fcd63a0636d10d/dazubiz.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608f868439b0a---vavuvodese.pdfIn PDF document text
    • https://27061010.com/uploads/files/202108151034194354.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/kqopfk5lr3d49um79nrmh50j91/26579812628.pdfIn PDF document text
    • http://guitarenko.fr/img/files/wexiwekagusekogamim.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105130047423580.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/1ed04hh9jmfk3835dk5ljgmcit/31151983328.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/kufasazigituwa.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/aed3e118c66c8a60567483a9e3c74a20/temevananojigujojisaxami.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/e346a51571708098c9cfa5b26a99f225/41339541478.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/ed442066dc3a82c5b84505adefc459c1/33127283703.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/53737350664.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f7062b9bc72---vidoragaz.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/lilaxived.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/60071144166.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/59949568542.pdfIn PDF document text
    • http://intergeored.com/upload/File/beduxisukanan.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/13187412564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cetoconazol+200+mg+bula+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12372 11176 bytes
SHA-256: b7a477b52abd1a50e3939ad961c57082d0ad3a9a396c8c9bb32a6f30309ff988
font_01_sfnt_off00013d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D46 20004 bytes
SHA-256: 147b8bffe88a6e75d801eb7d83a45deafd568f29079c32f9b23a3c2f321d69df
font_02_sfnt_off000171b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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