Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb415a2c811eb307…

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 01:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6d35d981c1570b1ae363dfc45070b0cf SHA-1: 851b93dc99e04adcae2cea61087124d3d64c093c SHA-256: cb415a2c811eb3078a866e04ae8e2b229bb54f063a37271b96e12cba41cd9b06
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised websites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://tpdw.pl/userfiles/file/2326051020.pdf In PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121317fd1dc8---fuluwugoxuripawitako.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/majugu.pdfIn PDF document text
    • https://kalnapilis.lt/kalnapilis/web/web/ckfinder/userfiles/files/49911398734.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/cc0ea2c76bf6653fdff5f94750252d22/72742973597.pdfIn PDF document text
    • http://rc-modeller.se/images/file///guvobusalu.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/36278939561.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/xoxaralekidejuwewu.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/64088690713.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/marisibona.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/337kh06gd63ukq2vlbj2bpt1m6/93620111044.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e1734fb14b3a3efbd6bfbf0e98057744/fojokugetoporuxufer.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/0455c9ac3cd730cdf6cdbdd5dca0c40a/bidawexavumevolazejow.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f74c56acdf---49305532826.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/doduzegojofajiji.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/a4d5b4066ffe01f3e5852a0e74aa46ad/69336744520.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/221eaecbb3e9b0bd48b8d81011421e1a/31375805967.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/29217886143.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/no8aii0v7okk8a0d2k7tbtb32o/wodesupetaxefimegajosigop.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/vaxewofogemewagisujupab.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/digepexawufijujo.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/0753b9c204ee752ad8c88da9089d29c8/mutoxezatorexularelip.pdfIn PDF document text
    • http://jp-cable.com/d/files/53576258001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=nihongo+tadoku+books+pdfPDF 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_off0000d326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD326 18332 bytes
SHA-256: 1914edd4ebdb8fb6be52a1e0e1cdabf51d66149d2c2b698cf2874796d78b160d
font_01_sfnt_off000102a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A5 10808 bytes
SHA-256: f9883197e571875d8fc57bf2c30ee81d68bfffb95afe4049ca91cac3aaba122e
font_02_sfnt_off00011b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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