Malicious PDF — malware analysis report

Static analysis result for SHA-256 e943b9f6dd76a59e…

MALICIOUS

PDF

91.2 KB Created: 2021-08-10 11:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 44b27bf2b3ea43c28b178735f582adc8 SHA-1: da6fbeb0ba084304451a44e1e9d5779a67a62bc2 SHA-256: e943b9f6dd76a59ef5c2dc7f4b452b575897f1d454483a9e18b4b1d9206eaec7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://archism.ru/uplcv?utm_term=sukanya+samriddhi+yojana+online+application+form+post+office PDF link annotation
    • http://kursadowicz.pl/Upload/file/53343849570.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adea9118e84---latakidi.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-9/20210609021217262808.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/a6b70e0a1eb581bed4e63684a861dc5c/22338242930.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38d7b5282e---86330712856.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/56517576860.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/wugasize.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/fozoxunipuruvibetosut.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/807b9dbb1031859e9dbca3ebe7b30170/disegefipo.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/54269299591.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/73425148023.pdfIn PDF document text
    • http://adveotec.com/img/file/30484811122.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/vijibawupilepewaxinud.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f4c721a98e9998ae24f79a996b0ec0c1/60919043201.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/niredupomumozejagesemut.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/dijulenuse.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/josoluxevukunov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870cd684931---pufigawoxelilar.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/o3gb24b5u033b4snandk82uaen/tanajerabalurinefiges.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d00cbe600f---92748018457.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58a4f74598---lebobiwizaxisaka.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_off00010044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11856 16808 bytes
SHA-256: e1602c6063e74399ad79a395aef612659cc543e52946d739239034b0e2e421ba
font_02_sfnt_off00014416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14416 11396 bytes
SHA-256: a251430d1cbd2cc10526fa85df9e790f20ef4f6e80d4109a2b9a0b25ccb79f1f

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