Malicious PDF — malware analysis report

Static analysis result for SHA-256 835f579546549461…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 15:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fca3a01332ea2f23456d8d8cf557bf84 SHA-1: 0fb4707c91c4b61f0fe6a9889bc91cbf87b0e565 SHA-256: 835f579546549461322841e27cb3d2120a3dbbe1ead050fc722a2683895cba38
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is identified as a link farm, with several links pointing to compromised WordPress sites. The embedded JavaScript stream and ML classifier further indicate malicious intent, likely for phishing or malware distribution. The ClamAV detection confirms this assessment, flagging it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=best+io+browser+games PDF link annotation
    • https://livresdarts.com/ckfinder/userfiles/files/96982092274.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/52651767345.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/nisexirirewonu.pdfIn PDF document text
    • https://strechybenesov.cz/content/1739270029.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/kujavipituderupar.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/89988730509.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/dudevukurutuxabagudimuka.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300cd91d61c---97549283435.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/38656263919.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/mifolarizulalodiluf.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/65957099185.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/rqokfhb7920d6k9qa0k4pfelpc/15976232752.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/wizezas.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/92952408931.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f757b808c4---keredonef.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/94243836384.pdfIn PDF document text
    • http://newo.ru/files/files/wazebidatake.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/keruxerabapifitisine.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/43681512988.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/6184680569.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77959692990.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/84120697745.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/72158533052.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_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 10580 bytes
SHA-256: 2fa22ea4c163219a4e31a4895573b7a8d8201f4e930bcac12cdcb16b2a3faa7c
font_01_sfnt_off00010079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001188b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188B 18172 bytes
SHA-256: 421f65c755724b405b1d8324a899810f79aa50497c0f279f9037358daf37fc44

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