Malicious PDF — malware analysis report

Static analysis result for SHA-256 92739b8982ddd513…

MALICIOUS

PDF

79.4 KB Created: 2021-09-09 14:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7863ff77bbcc12af1634dea59c15830 SHA-1: 11e1639d281c74c262bf152d2917fe6c810d5663 SHA-256: 92739b8982ddd5137815cb7c746e435ce1ff0285377eb304402b7273124de7d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The presence of ML_NYX_PDF_MALICIOUS and ClamAV detections, along with the heuristic identifying a link farm pointing to compromised CMS uploads, strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=among+us+download+file PDF link annotation
    • http://dalaichau.com/files/27768256442.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/80921699578.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/63769040849.pdfIn PDF document text
    • http://gibisch.info/files/files/555741556.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/lemevowibewodoxufifera.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/gimazozeb.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/5090489526.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/17235236487.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/lavotej.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/movusegifililirozikerunog.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/307f505d5d9d32feabdb0f91c9d44de0/sujib.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff2a5ddf6a---jafatavezosalifino.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/vogaviwuvi.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6206fe540c57d6d30cbb300cbf559380/42523507664.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/lapujo.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/resezususifegan.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/54839835843.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/36874807507.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/92713518572.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/wilivalebadifelas.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/gogenaropu.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202108312252223233.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/sovifupepevisomijidakada.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/94996981476.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_off0000cf7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 18860 bytes
SHA-256: 6461f1cdbc46e5df3f261aa539201631108170160e73e01a360e7247b74c6cd1
font_02_sfnt_off000117a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A6 10668 bytes
SHA-256: 1989b24547e7fedc6ea464518e59dc8a744c4a7217c57f688cda6352d4a97c07

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