Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a82c76c4cec1af5…

MALICIOUS

PDF

77.8 KB Created: 2021-08-30 06:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: efa66a89ca9075639a31172e976277d9 SHA-1: aabbaa9477d81aa610468f4b3273d9147ec3ce1d SHA-256: 2a82c76c4cec1af5f5e1421befbb0e86d1435eac2ab5f52731008ff2d20e7492
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=r+kelly+videos+music+download PDF link annotation
    • http://nigerseedindia.com/uploads/72157673343.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/vefodidojumivoxiwuji.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dixobifelobilapuxu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9515c5e9fb---56197128841.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/vatagenejepidubepufip.pdfIn PDF document text
    • https://naoshima-habitant.com/41718526775.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/wijagadujolizawulebegapaf.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210820105209.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/vaditexiwu.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/84347689803.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/17146d8fb160815951b685006cd0311a/34870598617.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/21280716449.pdfIn PDF document text
    • https://ksboutlet.com/file/files/88904199777.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/63609170889.pdfIn PDF document text
    • https://micsys.in/userfiles/file/44162758767.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/8293eb72aa4f9142d4c8c6a84c8e3eb9/30610362754.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/fawufinewut.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/58551736318.pdfIn PDF document text
    • http://apvn.info/userfiles/file/27331192609.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/94823743111.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612c3550cb615---56445645789.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/549e6146ab53138af0eea426840c24be/4443604194.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/wipomominijosotagoga.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/28298755298.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/govopipoxomiravobobu.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_off0000cb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB81 17424 bytes
SHA-256: 119792087703115f6bd97924384e0b1589282308c499e2e9e8eacbd5115d6f90
font_01_sfnt_off0000f85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11073 10836 bytes
SHA-256: fca6d60f011bdafc0828ec514ddad375bd4ae056bd90619f9635a9d6eff30837

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