Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b55636a646ca34c…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 21:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e1f463c82b4b9824ad5577fe8a2aa39b SHA-1: 551fde5b7517a8690bb3f7c63db765b53eba154b SHA-256: 7b55636a646ca34c173518b1194b531d5f0da691107c8fbd0b58d18e6ac1f712
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs that form a link farm, with several pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=kobold+guide+to+monsters+pdf PDF link annotation
    • http://pazzo.jp/js/upload/files/58964689046.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/domufefuzot.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/22377503512.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/80250405534.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/jekufatapovenaz.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/liloguropidofonen.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f080e442b8---penenosedago.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/83106055199.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/tafuxoxibe.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/xelepuvupenuxaxofusaradi.pdfIn PDF document text
    • https://ordermorestuff.com/cmsCart/upload/file/xodofexoban.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/6324881200.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/lovimetegulerudiwakegafun.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/dixopojomiterojupiki.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/70427650176.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///96631593497.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c59888167a---10729358146.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/ea7daf7e32cae0e56652d11e1ea1bb14/99209469820.pdfIn PDF document text
    • http://kotolantopeni.cz/file/nirumatolimowadelapulu.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/79579915366.pdfIn PDF document text
    • http://ewtch.com/upload/files/kotunosenatakovo.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/furizezejazowak.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/24801234255.pdfIn PDF document text
    • 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_off0000e124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE124 17732 bytes
SHA-256: 766ebfe934c3cf9ee1675b0fd911094cf6c0ccade34dc150d44c84c60c07c8ef
font_01_sfnt_off00010ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F0 10912 bytes
SHA-256: 03c928818e36f57af68e9040dd59e670aa72394005e9b92406d3c7e3c139d4e1

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