Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3636833c8df67b…

MALICIOUS

PDF

107.6 KB Created: 2021-09-01 03:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc146bc6d4913830abc97d112e8fdd34 SHA-1: 6a27bc3181b782fb52016c213881c07924c767b1 SHA-256: fa3636833c8df67bb8d7f14fc3a308bf291c3fc77664a7af2fae1531f4601f8a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to obscure the true destination through a network of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://asfus.net/virgsurv/userfiles/file/91987884675.pdf In PDF document text
    • https://niboparis.com/upload/fckeditor/files/38035117579.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/91298228225.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/1ftnn9r3oaulanfst58i5c80tv/kisubulebobutuwul.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7d3ccfc72---witukivuloluxaxipes.pdfIn PDF document text
    • https://goodline.by/userfiles/file/setapajavovanufulilon.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be795477bf---65550166670.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/13575740024.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b9603d418---tisanikezola.pdfIn PDF document text
    • https://fasaac.org/temp//files/1851889619.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/97735738130.pdfIn PDF document text
    • https://vpmemorial.net/images/file/67305927261.pdfIn PDF document text
    • http://guitarenko.fr/img/files/94306581190.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125888c54412---sipewu.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/kifirusened.pdfIn PDF document text
    • https://harom.ro/files/file/basaseven.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d89747faa---lanevugiluvile.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/wafunopasebanonimowavanaz.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/19623096687.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/xafodalubokazeweve.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088162ab3d70---25088156998.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15c10c56f4---peropidukirofovozefogoguw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=abstract+noun+of+priestPDF 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_off00013842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15054 21192 bytes
SHA-256: 1e6df24bec508257eed12d4a008dec013992512bf9562dfe607d3364956a4935
font_02_sfnt_off00018742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18742 10648 bytes
SHA-256: e110980213a150527e3784c35906a325c44263cd4ebed6f00c4625565fec71e9

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