Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ed769e0356e56c…

MALICIOUS

PDF

68.8 KB Created: 2021-09-02 07:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3bc431f75c85c1d8fd42ab033810d36a SHA-1: e10f6fd2c8cb5b761d336f837620629fee1419c2 SHA-256: 52ed769e0356e56c35ea91e01758b0bd5b253752d435b2acf8dcd47e3aa3778d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised Content Management Systems (CMS) or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on compromised infrastructure suggests an attempt to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=silver+1+ion PDF link annotation
    • http://kingsfinancialconsulting.com/userfiles/file/9032969499.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd8f842ebf---mesararo.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/54458331991.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/13087944ea6b7c0818ba8bc75e62b122/samigizalopopavelik.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/kuwaj.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c567d85598f---jupama.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/97957984874.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef6c7164e4---sularux.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/77980884311.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/rakexiredaze.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/ruwimafupofelixeberaxaxi.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825907ecb31---53084242744.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/3873143614.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/71097848236.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/25f6868b9fb85c12d11a7caa9ac7dac6/figotizes.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/7f11b265b4cf3db4b766cf99952dd18f/vifutamagijinosa.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/86aa9d7ec2135c350336002cb3c226f7/72489544394.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/31766959161.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/cf6791cffa2072ffc4f12e4a251ffec9/3016643574.pdfIn PDF document text
    • http://aimic.com/userfiles/file/xuxuvebawarejurer.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/kirolopuridup.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/db7c9352f971aee1b919b0c18cec7598/wilojun.pdfIn PDF document text
    • https://ksboutlet.com/file/files/xexijorogadati.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_off0000b446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC58 14428 bytes
SHA-256: 90497665f5dd105f62c285005d9f105b02f7873a3c7cf9e8dc6bf4df635c3ed7
font_02_sfnt_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 9864 bytes
SHA-256: 8848f24122dfb2cc768111eb8e7b84690e5efddc620b36498299f599c747b39c