Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41616d19c70887d…

MALICIOUS

PDF

74.2 KB Created: 2021-09-20 21:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea1688036a30ff4d6de79443a55e087c SHA-1: e12d196164cbb95b3580309b7bfffc2fa51ce3d9 SHA-256: a41616d19c70887dd7ada078458591c492b316cd30f9b2913eaa2bfd3945c3d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Additionally, numerous URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, forming a link farm likely designed to redirect users to malicious sites or download further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://chcial.ru/uplcv?utm_term=bee+bot+activities+kindergarten PDF link annotation
    • http://nutronicltd.com/userfiles/file/xexozadifazenizevegunud.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/pujelixod.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/vamuduwajetodoxe.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/jalosazebebefutusonab.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/81319504861.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613921f114f61---navesuda.pdfIn PDF document text
    • http://sgpeo.pl/users/file/81324621635.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f04a72ada---34130171941.pdfIn PDF document text
    • http://dakov.hu/_user/file/ritemomuraradijisuzewab.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16130a129a5a77---dekoda.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/21962370122.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/jefunanosovelef.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/fodegabilo.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/65571222994.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/tirapip.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/tobodevebugir.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/gevugivojofivologijizaxu.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/buxetutuvibigakonufawat.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/zegevufalolojiloxinakese.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbcfb0af11---nupumuruki.pdfIn PDF document text
    • http://newcityhk.com/userfiles/87152493383.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/wewarub.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_off0000bfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEF 16692 bytes
SHA-256: d59770bb2becf41ac79153ac2a168b4a299cda5c78a651390b21ed7d4f01dc6b
font_01_sfnt_off0000ea92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A9 10848 bytes
SHA-256: 195b3b372effb005a61196b6b1325d84d096a4c3d261be59720003603e4fc8c3

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