Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad803536c857573…

MALICIOUS

PDF

84.2 KB Created: 2021-08-23 10:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d084d24b483c8358d6ea42f13d2801c SHA-1: 50bc4dbb9d49289b189bef1778390dd24c03f1e5 SHA-256: fad803536c8575739f191acf57a2fe3e8270bd0139865357d2d793b9e5c7d4b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The PDF structure and embedded content indicate it's designed to redirect users to potentially harmful external sites, likely as part of a phishing campaign or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://philabc.ru/uplcv?utm_term=asian+paints+exterior+shade+card+pdf PDF link annotation
    • https://noihoithanhtuan.com/media/ftp/file/23202662294.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ede4c151a---2200871402.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99b8e1468---97289022746.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/kaninededotaveb.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ceeb5540d32---30215762227.pdfIn PDF document text
    • https://mihalex.by/files/files/vesorijibim.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/00f86b5989d0f9bf003210bca50ff89f/65443989217.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa307a123a7---velejavowezil.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/vuwazejexixeba.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121cac45af8a---sonapapulonabegi.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/ba0aac5f6ae31bbaedbba389f4d03eaf/zosariv.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/xosusufoz.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/fopajeniz.pdfIn PDF document text
    • http://exosushi.com/uploads/files/benuluw.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/khqnhftb78suuifmrel9kv2rj7/kefidalaz.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f08faf966be---dakuturuxaroditonobalafe.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/67891056093.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/mutobopisegulo.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/4828591560.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/17838964516.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/77133510497.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/ncbkfekr7k7m20dvfg2nnmjk52/20737010502.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_off0000e6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 16964 bytes
SHA-256: b3ed141a871ca07ad75b1d2f2e4054215ba8e6100805946acfc24575925afb1a
font_01_sfnt_off000112bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD4 10752 bytes
SHA-256: 21caea0f424890c560b4671bda4b819c35bf0ea6520f808eff4b8611d6a3bd6c

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