Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c985b2331eb9c02…

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 02:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e411d3bb1ee445e3f7e12d202233739e SHA-1: 1bc229d49f18c5f5833126615ede0b70950e8281 SHA-256: 3c985b2331eb9c02f99d73fc68ccde454b838cdfd49fc0b773a4b8c8395f5f0f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of embedded JavaScript indicates potential for exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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
  • 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://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/5t28b35kt5h8u2tsriohuoc4nu/44345418167.pdf In PDF document text
    • https://travelstore.tn/userfiles/file/80045312592.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073a20a3c8f7---85179675958.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/6921967681.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/3661c39f21793db4972e282fc8ca2156/68359520516.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/54511715153.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/wutekomadizaxofejedeju.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/bikevigolurojurir.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/47498041877.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/11838470107.pdfIn PDF document text
    • http://abpaluso.com/upload/file/11432187280.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/sufame.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/54582615326.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/gsivh901f1oalsfkstv8f86ib9/48282254016.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/e82bug933c0sq50e82mcdrpu36/jopozibotamuradewuniro.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3b17988684cdd2863ad0646e252e8057/96723413575.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608c583edca80---77349475840.pdfIn PDF document text
    • http://redactron.com/userfiles/file/masijaxuzajuxomu.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9394768018.pdfIn PDF document text
    • http://15thstpresbyterian.org/clients/d/d7/d7025cfb1d4df99eee5a588ecc3dd57f/File/lodegow.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/jenafinugomamimomir.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/nokibovuratezewokisifobuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=web+scraping+with+python+o%27reilly+pdf+downloadPDF 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_off0000db12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 18144 bytes
SHA-256: b44f6a2edd4cedd932d3e8362267836bd28ddd32c9945bb27e34c142c58cb61c
font_02_sfnt_off00012241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12241 11268 bytes
SHA-256: 9b093d97f3da1c95091b8af7347865eb9684c0e5ab5529ce3e0bcfcc0de15d72

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