Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38dd63921986407…

MALICIOUS

PDF

72.5 KB Created: 2021-09-19 08:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f216df198132dec34935978b18c1efaa SHA-1: c64ea435cc4f6e55784c2d2c650e980aef147eeb SHA-256: b38dd639219864071c6ba0dac25476c8af52a9c53917c5e253c75f0692103a96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many hosted on compromised or disposable domains, suggests it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aiming to trick users into compromising their systems.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=spartacus+480p+download PDF link annotation
    • http://elistaprezentow.pl/userfiles/file/28696547182.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/36182402884.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/witamimitoti.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/vunibudexaf.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161466da894eb6---78733898946.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf61b7fb7---zibujoduzigupaso.pdfIn PDF document text
    • http://packturf.fr/files/48060066685.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/37666183148.pdfIn PDF document text
    • https://tele-video.ru/upload/files/gapuzadodanelizew.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/5955674557.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/97539988805.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090523111651.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/95860959434.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/75699786323.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/8374706701.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/81724112321.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/dosonedogodetope.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/59849336860.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161363748d8d28---27092557122.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/xuwozixameridesineve.pdfIn PDF document text
    • http://iltorg.ru/upload/file/zogomopikubisuzavejuf.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/91251558561.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109172201162979.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_off0000b63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4D 17200 bytes
SHA-256: e6916bdd4ee3575f2a3c6d8dc7e64989f13a02668c2a2db93246b642abe99f53
font_02_sfnt_off0000fb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB07 10952 bytes
SHA-256: 02540d5efbf4190d9e34edecb9e18aef6d08cd8fe3b1d13887252b8079761bc7

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