Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7765a3fe6f047d…

MALICIOUS

PDF

93.8 KB Created: 2021-09-01 21:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 23bf20da182f29c9d25d68f5bd8bf223 SHA-1: ecc81921cdb53d1d79a7d09fa8cbc01110f77d8a SHA-256: 4f7765a3fe6f047df3e84b03cb3cc60a911bfaaccb334cbfc021738fa897fd34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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=words+that+rhyme+with+future PDF link annotation
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969a61e663b---24171302754.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104ceb31714b---26752687274.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/jegot.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8635bd236---80959846126.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/fosumunuwevelasibotoge.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/gikhecdeu0lmfe9aohs6ei2ue5/tejuduj.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01417f7d1---femigevozeginakafutag.pdfIn PDF document text
    • https://506hlapeta.com/files/file/18208130466.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/8130619521.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/66741825401.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/2543356974.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/zexifuwadok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa0bf1659c---359812206.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/budinivijuwifuzawe.pdfIn PDF document text
    • https://krossi.ru/images/content/files/tuwokonopurinafoxiva.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c3cc741e3463b62dff598527fd6e5969/79720085867.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/48228596525.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b999771512c---zafegojirulexeretad.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/zetidoniteloxitojip.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/3711464118.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/safejakanijoru.pdfIn PDF document text
    • https://coil.hk/upload/files/6576134582.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/655054931.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/79909884939.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_off000101ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EA 21020 bytes
SHA-256: 57fa828f89494b67ff2b4131a360c53b645edafd561cfe83c7a1ef3d6b126b15
font_01_sfnt_off0001379a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379A 10760 bytes
SHA-256: 9a882dcea0f886c800b949dd991b36ca8adbf8d6448ad75c177fc99362e9d556
font_02_sfnt_off0001507b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1507B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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