Malicious PDF — malware analysis report

Static analysis result for SHA-256 87efc74d364c1b8a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-09 08:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4012410a386942eb31146518435e6ee0 SHA-1: 1792c3aef45e0d023934c554ab8b91309776e7fe SHA-256: 87efc74d364c1b8aec8da8174fec4b7b934008fa6d4b0650dd9ed86bb2ed468c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. These links likely serve as redirects to phishing sites or malware downloaders, indicating a common attack pattern for distributing malicious content via PDF attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=anniyan+tamil+full+movie+hd+1080p+blu+ray PDF link annotation
    • https://ashasuchikala.com/ckfinder/userfiles/files/lulokaduvuzodekupetop.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/vuvuvul.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/duliweduzifozibilujipi.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/rixoku.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210907003804_nhlczl.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/dalugi.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/gikiwefotejujeranawa.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/rusowewelisirolulus.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dbacd26be---diwegegowejereduxexowu.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/70229585927.pdfIn PDF document text
    • http://dezis.ru/uploads/files/luxirux.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/62655346351.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/gurudevopilanirudududun.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/jezop.pdfIn PDF document text
    • https://polaria.cz/images/file/wefijizakebefanugixa.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/kuzogokus.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/43940151053.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/62aa3ee0b4cf28eeca2f5bac41843e05/22252695706.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e183dbc12c1f18956470aa01a831f542/majirijojanaw.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1cd2868ee---51242781356.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/21483106943.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/gagaduxazejonimaf.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/zaxajekijazopotokimunekos.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_off0000db18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB18 20004 bytes
SHA-256: 8ac493b5ba73132ad4bec7adbf00a7e39bc7f30c7783f9a8dd672126a9f38fa8
font_01_sfnt_off00010f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8B 11376 bytes
SHA-256: e9eb8bf527146eb660a63a64af50ffe1459a1cd7e7c8ee8f0974521f788a8be9
font_02_sfnt_off000129fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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