Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ba63f554135e76…

MALICIOUS

PDF

88.3 KB Created: 2021-09-05 08:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d32aa5db5c5b79b41123a168add74608 SHA-1: 29e59b48e804fcdb2ba6402826bf2d61d19c17c5 SHA-256: a5ba63f554135e765fa30166ef4469f5f399d1fe8a94c567b45100605d3a1ddf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. Additionally, it features a link farm pointing to multiple distinct hosts, some of which are identified as compromised CMS uploads or hosted on disposable domains, indicating a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://studiomarcheluzzo.it/userfiles/files/piwizazukepafujilimapev.pdf In PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/kezijapegamemimukasepelag.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26220735798.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/linul.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-1/20210701151932372229.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c87f00aa---64161320495.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/fosofuxufafanevigalisib.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/litedamelumebolizapoka.pdfIn PDF document text
    • https://aedwea.com/upload/foto/78377645911.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/govodekepanibixuguz.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/16761000476.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/49787245827.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/xejaxasoxasabe.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b79e3e3bf1c---70547727458.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/menadoditobukigifewe.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/2999985943.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/53c9bft32bms1cj14duqe3rq3c/netasobakof.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/34721135b29c3f0aa6757f3a9f5b4dc1/13676942830.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/puvimadovexumepugineve.pdfIn PDF document text
    • https://securitydm.net/slicice/file/28673521969.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/1b09b19320c4c06cc224a5fe016ede7e/16616249711.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c6bce35bc---nozapuzoxuzemanukewonur.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/zabexaxo.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/bajasib.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/78203999363.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/32350233527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ielts+reading+test+answer+sheet+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_off0000f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10950 19416 bytes
SHA-256: a484b8cc5835a6db966390a16137ebd8150cf400343f9007056ffa7389effec7
font_02_sfnt_off00013ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC0 10692 bytes
SHA-256: df180f4481ac79cb4d86b25dd8f3c48be54c58c6d591351124f6108dd8abeeed