Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d99bbab586e7f41…

MALICIOUS

PDF

74.3 KB Created: 2021-09-17 14:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 884573936fd21ea19e69943a784b712f SHA-1: 9ddcfe8a306e5e5e455b07af983525bd5676e7ac SHA-256: 3d99bbab586e7f4169f9d68eb667af045449c7519935573c25706c49bb93e710
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads. The document also features numerous URLs, many of which are hosted on compromised websites or disposable domains, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=principles+of+macroeconomics+8th+edition+pdf+download PDF link annotation
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161445e3a8e57c---pefegelojorokijil.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/7185658556.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613443a7db194---44605816813.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/desugesale.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/dujikonopikijaz.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/zabutunitewomigavidezu.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/nokuwaro.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161417ad5d8403---wavixufusis.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/lokanuxewomusomazifom.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/89736154940.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/d069bfab7520e7ce526748a1d24d4319/85612727956.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/puxonufasomije.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/tozidiburesawufi.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/dodafejebevagumizuwudu.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/12813429013.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161426ceeb7c73---82116819189.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/wasujetafunovobexasipe.pdfIn PDF document text
    • https://biocoils.com/img/file/69041401883.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ninugopofexaz.pdfIn PDF document text
    • http://trieuduong.com/images/Download/fenopixoxip.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/simaserojevexofedodoj.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/texumitolivat.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/58418375328.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/revuterunolu.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_off0000bc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A9 17120 bytes
SHA-256: 4dd37ca3445973d36fdb2dbc6d27bf32c7a173714b94e83e7e1bf3d0aa794920
font_02_sfnt_off00010127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 11180 bytes
SHA-256: a5a4a8da6fe629878c616a2bf3b04a850c0deadce7f17ab141d96638e1fb875b

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