Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da94ed1790f36f5…

MALICIOUS

PDF

85.8 KB Created: 2021-07-08 11:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 809878e34c77579d7ba8f240c0a7d7aa SHA-1: 0519b000314c9b802f36abde084a3e062f479d5c SHA-256: 5da94ed1790f36f52fb1813fbeec13662d84ef2f51c84443f02ada37b3650d8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and link farms pointing to compromised CMS uploads and disposable hosting, strongly indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. Although no scripts were extracted, the structure and URLs suggest the document is designed to trick users into downloading further malicious content, likely disguised as legitimate files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://laborke.ru/uplcv?utm_term=download+gta+v+file+for+android
    • http://aliglobshop.com/userfiles/file/34986692063.pdf
    • http://uniroll.pl/user_images/file/62248472407.pdf
    • http://usaoxin.com/userfiles/2021-6/file/34657898517.pdf
    • http://beergolfers.com./blog/images/file/sazeg.pdf
    • http://agrobud.net/uploaded/file/49370487812.pdf
    • http://aqbnb.com/uploadfile/file/10192416027.pdf
    • http://yaqeen-eg.com/userfiles/file/33492054841.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16245643967573.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608faeeece55b---rimapuxorifokigebes.pdf
    • http://arch-teh.com/pic/userfile/nowiwovoxidoko.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080e5d849607---dizafisusenavego.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160859e807fa5e---kiwowijasuwij.pdf
    • http://curry-box-deluxe.de/userfiles/file/mogifumowarugo.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/l7a3jf6dbeiafrmsb7mquico2r/jupevurumipunasar.pdf
    • http://propellerclubsandiego.org/uploads/files/55593633291.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/hsruc1jdurdb7ghab3qsrlpoqj/jiwuvapirosegawajidako.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f640d2831bdbc1613c7a11b28b23816e/76261314792.pdf
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94960050256.pdf
    • http://lighthouseofworship.com/clients/44803/File/bafamiluzolubapalab.pdf
    • http://tinnaduraflex.com/uploads/files/zurati.pdf
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/nukovurisoj.pdf
    • http://erex.hu/upload/file/nojabidevebole.pdf
    • https://giasusinhvien.net/upload/files/veketema.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/03eaa545fbac6b6eb3ef177d626f66b9/kawifebipovine.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB64 16792 bytes
font_01_sfnt_off00010376.bin
e0e935d71ed3002eaf6ac43f5e1a582289e0790bd8387365f4049b9a5a252e5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10376 17944 bytes
font_02_sfnt_off00013222.bin
31c0fc693854753302d2e31525c6b6f331cf37bcc6562ef16b9e59f47dfa27d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13222 10516 bytes