Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc2f44657c6e860…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 21:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d123e146c4d59fda3268a5f3a948278a SHA-1: 82cdab4fd23bb55646efe7834c88ad69f66deb74 SHA-256: 5cc2f44657c6e8606e7b93c1c14f6d73428195cdb3295e43390eb66e74bb0d91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, including links to compromised WordPress sites and other disposable domains, suggesting it's used to redirect users to potentially harmful content. The presence of JavaScript points to an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=ios+14+launcher+apk+pro PDF link annotation
    • http://constantcontinuity.com/membership/data/files/53170806843.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d08fa0ffcc---zigigujofibigubiz.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0c82ba79d---85159352102.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/14137584403.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447cbb48d40---segivevagomukoguzejuwo.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/78205823929.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/11235678950.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/77458658010.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/zijukez.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/42380919849.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210903094854293214v58hh.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161308f0398cc5---85029388542.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/sijewapobevelodujotasiti.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/kixomo.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090906224148.pdfIn PDF document text
    • http://npas.ru/pic/file/40753289662.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b65f450e01---10862094913.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/37986302568.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/48012934333.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/zefowawedivisafibexupape.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/wekavevowufefamexavaz.pdfIn PDF document text
    • https://virker-ikke.dk/files/joduwawitoz.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b46b409310---55672516288.pdfIn PDF document text
    • http://jarosi.hu/files/file/taxazo.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/2021364805.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/xikilirefuborovefofiref.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/90700570176.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_off0000b6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DF 14500 bytes
SHA-256: aa34f7f7bcf61e4f1c1af515470f7c6beaa6845c7e8ea3fd82f63b390d4e1ad0
font_01_sfnt_off0000dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 10552 bytes
SHA-256: efcf46e09cf665336fa5018b0fc1b1ee163b6e2c3bfdae7f3cf91db059b38690
font_02_sfnt_off0000f305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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