Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdacdc3e28b7c80…

MALICIOUS

PDF

85.5 KB Created: 2021-09-12 07:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5dfcfa296d88e81f2c9370f443ca9598 SHA-1: 960d5650a5f8d2becb8e0ce3a07b164786acee06 SHA-256: bfdacdc3e28b7c801564133af38506db09e1a337e70c4a0029a89e655eb72f32
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. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage trusted domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://kalmi.ru/upfiles/files/setogimupinajepukewe.pdf In PDF document text
    • http://phutunggiahungoto.com/uploads/files/96914257806.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/jejilotusogudotope.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613702bea402f---xitokotokowutulo.pdfIn PDF document text
    • http://pbpharm.com/upload/files/81861418927.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/dcd7b94714e68a1c084e6a1161e22cc6/23289736928.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/52974351504.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/81467359901.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/68290059247.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/34998109841.pdfIn PDF document text
    • http://donghotam.com/luutru/files/239139329.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/nezifakuwivejokifubinosoz.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/57096530468.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e1302a597f08a50a52692eb91b45075f/zuxekuwepov.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/60833142104.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/55968814854.pdfIn PDF document text
    • https://kopari.hu/files/file/sigabiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=font+numbers+copy+and+pastePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C4 16724 bytes
SHA-256: c1a635b2628727a8fccf08538df7852b1315be30636da5453e9bf00bb22f436f
font_02_sfnt_off0000eb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 10868 bytes
SHA-256: af6287b04b681f36d0b1b2fd3132cd8f830992afd9dfddba6d12895066558453
font_03_sfnt_off00010464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 25992 bytes
SHA-256: 5d642f9506a4a13c0c4a2dff1ba3600978117da4298f65b5f4a3ee8dfbeb1eae