Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b10b6569567b62…

MALICIOUS

PDF

75.1 KB Created: 2021-09-02 07:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0aa2db94e440b0b158c368caa91c74e7 SHA-1: 808c17c3ab87f9217f84e2a081d5c8c01af86318 SHA-256: 77b10b6569567b628fba14288d9f0560fe9c285e0866d9f1feaefa81111bb710
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious intent to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=what+is+super+key+in+database PDF link annotation
    • http://xn--80aikni6a0b.xn--p1ai/images/file/ropizizodavuxuvotimizon.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e38a883a57---luveviwugurelu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611de887b5f39---49610115749.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/94376108095.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bb53853cb---92351602901.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/fe789ff2e20ad3b1494b986fff2e3704/11943022439.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609428963c862---rebijagu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098565292048---79972017636.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/dojulixunaxat.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/ruwemenoge.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/18316502453.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611f2a6724172---19113423192.pdfIn PDF document text
    • https://invest.pl/userfiles/file/xazuboletarujibi.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/6031811413.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/07jkji9846uj11gpvhcou5c0ea/58506910107.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/c5qcb13sauljv4l5k6gbtl171m/49352394193.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/79136187380.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/zilikafaxazezixewirig.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/xeguleli.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16128199651370---golusorid.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/riniwetukinuvegiz.pdfIn PDF document text
    • https://corghialberti.it/file/jewolotonaxoman.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ed6649a94da26c15c557a816ae628356/nukuwerufivato.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_off0000c1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B1 17136 bytes
SHA-256: 78b786e7f7675f8630a88342c6e54037deddcf4c3ea1269600c3452b62e6fe20
font_01_sfnt_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001064a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 10760 bytes
SHA-256: 80ece87079a44d9adaaa0fdbddb22e40343f9c42caed87a328d1cdfeb6d1c7cd

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