Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed20993e1792acca…

MALICIOUS

PDF

73.6 KB Created: 2021-09-11 20:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a8576d6eb73dfe5864bbf4e2d9362427 SHA-1: 41a21748abd8928f7bac8d66a0c1003570ed82d8 SHA-256: ed20993e1792acca87a9dca794abdd207e4e9dc4afc84c4953e8a9efdb013624
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The presence of multiple links on potentially compromised infrastructure indicates a deliberate effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://synerhu.ru/uplcv?utm_term=law+and+order+svu+s22e04 PDF link annotation
    • http://hitelesen.com/userfiles/file/godofaxowogutovisegulal.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613616690ea42---50525439799.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/q6uekmjlphd0mf4a3c3c6nakn5/48843983854.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133438e41859---dijakamegu.pdfPDF link annotation
    • http://dglytbt.com/upfolder/e/files/20210904180017.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/77708015634.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/wibezowoxevu.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210910_BCD7A5345FECADE8.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/34919724771858f6ce072fd54f2d68be/baferobejalawazajobek.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/24461319494.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/40540967165.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/26421699090.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/zazewunopememem.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/77612111592.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/wunegasewovujokojugarogid.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/71104576821.pdfIn PDF document text
    • http://cascad-trans.ru/files/firajomumukesazarubaruten.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/nazivumipex.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/ab0a8a6202643371e0be89d1138cd4d9/tuxokirozopevuton.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138273a3a944---tukedogikove.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_off0000bb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD336 17996 bytes
SHA-256: 535dc8104b404f0461e456b64b60978e39d36945f2cb14a641710fc3516f5ca2
font_02_sfnt_off00010144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10144 10536 bytes
SHA-256: eea7d48c1957cea8c0417fb071c7a200c76f1e69c3e5fb1a66eeae677a867f71

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