Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9ce81e0d23d201…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 06:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a13312071966a9812db6a610730363d SHA-1: 594692d6e9707371dd51ee42144562f6ec8f392e SHA-256: bb9ce81e0d23d2012115d08934d60bb471ef1840d763f3c183ea89b777e74e3d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to compromised websites, indicating an attempt to deliver a malicious payload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a download button lure further supports a deceptive user interaction pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=account+authenticator+android+example PDF link annotation
    • https://inprovitbrasil.com/ckfinder/userfiles/files/beliwovubimajakas.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/wurefifeb.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161409d247d5f4---49726359722.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/23726037006.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/98611513133.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/kadob.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/57928564076.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/xezapupela.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/88213149047.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/30230755732.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/wuroxepibijipulagika.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210909221130.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1614224ddced60---zexozizebu.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/jiganotofugine.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613feb0931b56---3321025487.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/golufobuberonujop.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/4d406447218a90d69b8b9a408eb867ab/54573667846.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/rosixuduzaku.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/87841872843.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/54444016572.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/be124439de5205f54592d9bb3ef68d09/72655913623.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/dugiriz.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/pomurexe.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_off0000d933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF145 19152 bytes
SHA-256: 96877fa2b7b9bd6b9ce58348d9fafa88d411366ce0e443ec11b54ad29533529d
font_02_sfnt_off000122c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C3 10796 bytes
SHA-256: 71c2c5851d79f4df71f04e6011e3aa169adcda3043814ab579cb51ed0804de56

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