Malicious PDF — malware analysis report

Static analysis result for SHA-256 970af53b221b4cac…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 07:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 986712326e525279a8fb0daf8a107b36 SHA-1: 7dd3a1a165b691aa3cbf671417c2dbbfb966571a SHA-256: 970af53b221b4cac62192660fc1157f838e8fb55f5e39f3221e42c506a5d5f4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The document functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised CMS upload directories. While no scripts were directly extracted, the PDF structure and the nature of the URLs suggest it is designed to lure users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://sz-nuoyi.com/Upload/file/2021072810375976975.pdf In PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/cit8h21vvopifvp9v85lit7cvc/mibiwokiposupurawafegaw.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/cfcsid6cb52ns7rf24h4nkgao4/76318329036.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a474697911c---tosumibetapa.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/23612804099.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609489925452b---vitamenetowin.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/10330494991.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b91382572a6---roxukaj.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/54113099150.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/76465224369.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/ruton.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609736e1d9c38---mibeg.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607732b5b949d---ronin.pdfIn PDF document text
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/zevexi.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109fed56269d---96449513833.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/nufubaditikowuxojujex.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/58213874006.pdfIn PDF document text
    • https://service-panev.com/userfiles/zekonubenamufajakuvu.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/gowaratoxizulebopifivivuz.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f81894d4ff---ramanugukurepi.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/71885206260.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/kajanivejid.pdfIn PDF document text
    • http://minniemleefamilyreunion.com/clients/4/46/4626b253669c69ed517e077132fb6553/File/3772483457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=manual+transmission+cars+2017+australiaPDF 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_off0000ea22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA22 16664 bytes
SHA-256: cdabd2bb6bedf05bf51da165958e8974d4feb94c27fde597ac2464277af1313b
font_01_sfnt_off0001155d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155D 10696 bytes
SHA-256: b9aae8cf30cce6e6d6ce725270f4452f9d403b44962cb43d2d607660a3453aa7
font_02_sfnt_off00012e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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