Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71827c767408546…

MALICIOUS

PDF

75.6 KB Created: 2021-09-04 19:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9f013e5eedca3afeba29d7ffc29f3d6c SHA-1: 9426d2531b560b929e88320e06a1777ff953d641 SHA-256: c71827c7674085460699de1dc7adf548b29a2e7a790b5c2b1426e109025b9a9b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript and multiple external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm for SEO poisoning or phishing. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing malicious browser components. ClamAV also detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://bursakaynak.com/userfiles/file/pijadonakilimejuzawoxu.pdf In PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608372bd5a4d3---85151708812.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/e080328c1b2d4261d1bf950d9064b01d/wojuvo.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/523843846.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/07/23/dedorawopo.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/jilutoximid.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/sufojijolirorizugoxepu.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/kulexivojef.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/9b29d3ad0f5ba254902463759c9863f7/63731930367.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f7ffbe413---94674136036.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e014de800---60191368291.pdfIn PDF document text
    • http://wamer.org/userfiles/file/befezasevafuz.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/palubikaxevemezilazuga.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/r36r1k6n8abup6oc9dpaje7rqg/punawufajim.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/vukusazusajure.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/9581f774806343e9e4a405dfed414997/merizadugiwopupef.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/38692804225.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/45164240432.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/74f82df67a8b75ad527960db4b43bd11/nujumabafuzimiraderubuvu.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/cmbgljt95ph2iiupifl97mq2tj/pejawumogasupok.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/40028543491.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79d8062d4---86958906559.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/1573565012.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/41893924206.pdfIn PDF document text
    • https://careoncall.in/userfiles/files/12643914529.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/b3a5cda89cc6c5a70f75decb976348de/wurutomapilonevomideteme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=junie+b+jones+first+grader+boss+of+lunch+pdf+weeblyPDF 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_off0000c14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14C 11460 bytes
SHA-256: c738bd3ee2f7c66d5a2f4e4509c164eef7b1df51468d5aba5f58e87d8116c2b0
font_01_sfnt_off0000dc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 17060 bytes
SHA-256: a71d063018e2317ee18d07d354594f929339b8f84aa09ff951d936bdac6ac113

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