Malicious PDF — malware analysis report

Static analysis result for SHA-256 588209a173e21c6f…

MALICIOUS

PDF

87.7 KB Created: 2021-08-04 10:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d53a9932fa6804ad9afe61c244a02f3f SHA-1: 924f2999ad0f2d3f177c1562d8b796ac50d1dd34 SHA-256: 588209a173e21c6f9f17c33f328d9e508ed0d7c681466d4288f5515d4136ec65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to websites hosted on compromised WordPress installations or disposable domains. This behavior is characteristic of a link farm, often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, indicating it is likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=what+to+eat+while+on+advocare+10+day+cleanse PDF link annotation
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/97314783709.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/3953352577.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16079a5cf3f7b4---jupasiki.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/c71cd2cc243063453d4a6812efb69c08.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/10594296209.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/57851d9d588d4ee80e85c6eb94bf3d54/3863961489.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/vibudodonudawiwamol.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad867759e9---lodolidaduvo.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a849f2f2764---83779703455.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/39742357303.pdfIn PDF document text
    • http://nktrading.qa/file/files/nuburasidugobika.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/75888485358.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/17843172979.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/71989412772.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/28343379127.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780c19f308f---bowel.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/27002088689.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160757811c9feb---24514449166.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4636e8c4d---tudedabuzed.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dbce9140eab---75805437900.pdfIn PDF document text
    • http://zzquansu.cn/d/files/sutaz.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/jekapibajeziwagivazisol.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/43399048332.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/2do7354jh4g7rullqrub2vp2p4/kuzifujejinug.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac75741f1c7---91751884127.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_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 17248 bytes
SHA-256: 29f3c1636dc74927dcfce055d817e09be837f056e666503ee8deae93651a0500
font_01_sfnt_off00011d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B3 10900 bytes
SHA-256: 8106f4f45456757850f3fb7f263b7cb87d37205b8c4da555b964c923173e46cf

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