Malicious PDF — malware analysis report

Static analysis result for SHA-256 efeca61703e5cca6…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 17:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d7c1017845ad049a1cef756f4379f6e8 SHA-1: 3f2de2b5a2d040a035e4e1ff3d1932ef1c1635fb SHA-256: efeca61703e5cca6c84b3dfd9c8802446598ccb75376c46e803eaf37838497c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The primary goal appears to be phishing or redirecting users to potentially harmful content through these embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://inwebjor.ru/uplcv?utm_term=bostrom+superintelligence+paths+dangers+strategies+pdf PDF link annotation
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a7629d415b98312341b63853969c66d8/kijivexibe.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/38umjcneklf6pfkr1feij68rss/jubutovaxelosamonoke.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/didagikome.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/f9okmvopkm5a0r8f35hna15ip2/dubigemazub.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/ledipelegezojenose.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/p57b08ed917j5a30ofucsntei0/21828500282.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/47009019852.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608191c94fe66---17568697871.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/tiraguvilasuwopatulogakak.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ovvsuta1s2hhhb5sbgn2k5faba/95806888870.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/88238712735.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d47a600d69---63149536571.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/80710830709.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/83098587483.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/47933289203.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/68853695091.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b545dcad2242b0ac03ae3536c3155502/10778492003.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/94281362982.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9f7843b4ef66c3a95f4bddb44a940edc/zabekejiligesu.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73b41ca8d---jazawowatesotu.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/radofor.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f6bebfb5236---70076050251.pdfIn PDF document text
    • http://wernitznigg.at/files/mitutibupizukejes.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/gokuxudewipawipop.pdfIn PDF document text
    • http://malifer.hu/upload/file/makumufuzirudidub.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/kagonavilamaji.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_off0000cf62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF62 17012 bytes
SHA-256: d6f4454d207079fcef80db39b138fa475823770dca41c3a929d8ede9bb6c6c10
font_01_sfnt_off0000faf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF2 11220 bytes
SHA-256: 3d76624a4debe8362bc86518ed5ea95c2800b36ea3cdda5a4dc4c7243a5d9225
font_02_sfnt_off000114db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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