Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a79c1a17e5e79d…

MALICIOUS

PDF

74.6 KB Created: 2021-09-13 23:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2f8f52812ad6bba1e2ffe94851fbf89c SHA-1: f96caba5e934c6994173a057e42aa529abbb592a SHA-256: 86a79c1a17e5e79d6bbeba5821acd1ad5d9f027a6ca44ca22cc42316c70bd610
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external links, several of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing lure or a downloader for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hairfibers24.com/upload/file/foranefipebowegu.pdf In PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/rurunuvukugi.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ad7c9be7f---jutaledunutametisiju.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/kuganawuwezuforosamuj.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/zejukized.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210907_142201.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/matemaludosusenu.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/luzadabab.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/mizepezesik.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/25526654459.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13582269463.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/19629563581.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/82606007687.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/62890148137.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16130ad6cf401f---1475437105.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/niwus.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/23651559171.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/sadipurapube.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/zikopejiberuju.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/misapirezufasatogefeboxut.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/pisavokuletulos.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300379ef9e2---zijibisapolixovufam.pdfIn PDF document text
    • http://atamergranit.com/userfiles/file/tatiwab.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/lilixipasukatogir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+install+apk+file+in+genymotion+emulatorPDF 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_off0000bd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6D 11084 bytes
SHA-256: 524998bcbb4540f95ba8eb8048f0a3cf0fbed155b4e4504039e216f0b6be69fd
font_01_sfnt_off0000d74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74B 17572 bytes
SHA-256: 3fa67a8418abce55c0ff570e92c0075e42eff5098aace357937c6201eab9b4fe
font_02_sfnt_off000104f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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