Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fa87020d2c31e5…

MALICIOUS

PDF

153.5 KB Created: 2021-07-08 07:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 67271c5e658a700960ad92720a03c167 SHA-1: b7e963aaa85346905948e93fcf4f7ceb151ebfc9 SHA-256: 73fa87020d2c31e530ca18b218cf580cc181ff0e25f3c8bb48eb69245f06cb27
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a malicious document used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://commune-bourre.com/userfiles/file/66786304973.pdf In PDF document text
    • https://acavacecio.it/userfiles/files/wozubaxuvitesakagu.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/f12771694bb4a6f2c99559002b881b6a/95567188153.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3aadbacec5---86929052111.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/didotagunutevivebixosisi.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/d614ad049bce2b7a1bebc014c2b3797f/50386635650.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/lamaterosakujujenadexugig.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a14d67d504b---sitasibimerenizu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16080265ba0287---2582609267.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/41629625015.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/farelixuxolokimosobaris.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/niwelonusivemizozev.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/44082371729.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/kunix.pdfIn PDF document text
    • http://salwex.hu/file/45618044033.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1624263508.pdfIn PDF document text
    • http://matras-devison.com/upload/file/67926241291.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/tepajepazebavoriwig.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3917b730fc---94114074849.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/rojilomovuxesonamoru.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/67854831051.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/21865480887.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dba3917e9e3---ravogukakalali.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/dinamev.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/mifenekajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=inductance+and+voltagePDF 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_off0001f926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F926 17644 bytes
SHA-256: 09913a2032f1b90af908f586a73466c5ea2063b55725b71eb82c8398f9160de4
font_01_sfnt_off00022796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00023fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23FAD 10304 bytes
SHA-256: 52be9c388bc06d8c8ca3ac72515dfd80b5c7dbc3209b3084388bf6cb5298c767

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