Malicious PDF — malware analysis report

Static analysis result for SHA-256 606a79c30bcb2cc5…

MALICIOUS

PDF

91.9 KB Created: 2021-09-14 15:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ebbac2d6a0db132cb7051cf4ce8115ce SHA-1: f78e3a92ed59bccbcb0500db158059b7ca78fa00 SHA-256: 606a79c30bcb2cc57fde6a079c2220211fd9893a902af3a2f71571c5453b9ecd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of multiple links pointing to compromised WordPress uploads and other disposable hosting suggests a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://aquatherm-graz.at/files/11425591857.pdf In PDF document text
    • http://bsbcarpet.com/userfiles/file/93765781527.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/12376125487.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/wogekexoku.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/69559943244.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/91026767418.pdfIn PDF document text
    • https://ckmandarin.com/uploads/tanoretob.pdfIn PDF document text
    • https://protum.se/file/60927369850.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/sovexipawaf.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9feadd302---narejezudise.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/zilefefesuvumebedetobosaw.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/vabotuwow.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/74638388737.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f03ca92b98---tovuvosibowozipe.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/f56a6c5a6c1aaa10406ee29ae177154d/73847591687.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161344df5ab458---kojuru.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210908182908.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a93be9f766---salipafeditarafew.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/zolugokumu.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210902_9A2FF159D9D8A085.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/2ca733394acf32b861209e30b689bd08/27139460028.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/78814239846.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-11/20210911031539550641.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/rilunogiz.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/42859870493.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/33442820106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=gta+4+requirements+for+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D0 23556 bytes
SHA-256: 51a3a2edd90246a8e4bb8be2ceffb8789bb4df51457818103ed2f99aca42af67
font_01_sfnt_off00013168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13168 10832 bytes
SHA-256: 04c9678767e177c7efa60817017b8f702e7c0b3f6611485dd6fd672f43c997c0
font_02_sfnt_off00014a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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