Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e9cdbab9cb5f21…

MALICIOUS

PDF

85.2 KB Created: 2021-07-16 10:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4523327d43b2e086d7531c2b018470f0 SHA-1: 3dfa52041dc22f5195094dfb164e11a778d6b777 SHA-256: b4e9cdbab9cb5f21b63c765cef707290244f08fbcce88ec8fadbf76a52404fac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress uploads and disposable hosting. While no scripts were directly extracted, the nature of the link farm suggests it is designed to redirect users to malicious or phishing content, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cvsc.co/userfiles/file/39295430974.pdf In PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eedf1a922c---34782247876.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adb431dcc85---69704365985.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/dabawadawipakeporesilo.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/58cd80a694ee7ea4ea32361f36004ad7/25966690943.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/42826753138.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/6q1aou7e19r8308jnevd6hvd77/sobajovixodem.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/94003211585.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/rasuvibuzutabenofubopil.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608819365b078---92590036951.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/87027389834.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d71cfbf225---gixuje.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/41596581474.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/belqetnrgq4f0ptaoiofvhui05/padabebituxovemod.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/08124422044e0b53e6f4bb456a50a318/56778587749.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/dc353f02babb95eaecb394aaa8454960/76970651183.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/0qpo26dk1kpq3ivhgtb5gqun05/kadarides.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/842ac071631ed3383f3168f3ff772e69/loxotizepatinewubum.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/bebuginobu.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88fda6c13f---28483040764.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/juvdkur1enggd7ll0d2asjnn3n/98280819316.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/68015510529.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/xomisoxenepusesugiz.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160869935e6830---60025684614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=putting+0+on+w4PDF 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_off0000ee15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE15 10064 bytes
SHA-256: a83e3bfd2a4e826b1aea793bb897f2234b1fe8f44ff0d11ee92bb71e5b981cb5
font_01_sfnt_off0001049c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049C 16708 bytes
SHA-256: 11122cadc518fc4039e6880726ae11ba6de3aefe93c0aefc48dc1009ca14189e
font_02_sfnt_off00012fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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