Malicious PDF — malware analysis report

Static analysis result for SHA-256 f725af389f74e78e…

MALICIOUS

PDF

87.6 KB Created: 2021-07-24 08:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 43d4307396c239d04a4a2b83e806c2a1 SHA-1: 15ae3ed3d796fede106623929ae4d6a72dad5a3f SHA-256: f725af389f74e78e23801973d887002ce292195bda9499d81e816a339d15344b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the structure of the PDF suggest it is part of a campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://parfumzone.ro/files/file/polesegabowazofojupaxige.pdf In PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/hl41j1hemn8o59lqlfjsceiht7/semef.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d78e3311e88---vaxatisowivotaridexo.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/80719893804.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/9btj911psjg7n9vfiibdhv5kos/61781948992.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/76e3930c923df07c7d6b3997d12d679e/jazasotoguzonuteza.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/kironamirovivinexetufe.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/86401054123.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088438fb4232---zetodiki.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee98b5eb2ea---vezonerugajozegesom.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b33707df4b6---12049727335.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/6dc5d05fb024cabcf25ea0abb51d3c49/87125165015.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5148f3cd23---gopunagike.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd9eb75486---gotip.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/lunujuwe.pdfIn PDF document text
    • http://flomojapan.com/upload/files/nojagemazamubawuzovub.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/jixazuxu.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/moraxilafejegibusaso.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dc204f2d3---44591610090.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b53609ec9ef---23585166075.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/72200779887.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/zajofefivozimet.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/palaxal.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/wutiwikopedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+write+an+email+to+request+information+samplePDF link annotation
    • 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_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 16800 bytes
SHA-256: 22bde573b5bc73b0f3ce654e60c2bb46f746cbbb471273a28cad85742da18b45
font_01_sfnt_off00011e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001363b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363B 10844 bytes
SHA-256: 8f884c818fe309e2117f87d77beae05f77995e76b9795767990a1e107e0f9c10