Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a3cd749a72b245…

MALICIOUS

PDF

86.7 KB Created: 2021-09-06 20:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0418c171885b66d85e165d86e6c86f91 SHA-1: df3322276a1d7199178d5817784bedc3cd7821ee SHA-256: 05a3cd749a72b24512bd3a317cda3e43dcd5b856f9aa074bbf34587c2b4a92a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The presence of 'utm_term_redirector=True' further indicates a redirection mechanism designed to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/00na04gd1kfu0dscddkcmc9egg/gubufibezodineriv.pdf In PDF document text
    • http://blueyee.com/upload/file/171322535408.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/5jcptq9556vnp9fa72jf78j8ko/dukoxidejesaligiva.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/4033299762.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/82059047330.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/venunirabenujirufo.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607236a16c561---39153892565.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/kozivutulineki.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/1bf80ba37d7a937fa2341017f5c7ae10/733768387.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0ad249ddc---38131794888.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/papedej.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/vodaxizafubasugikikunez.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/20233638424.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/supitutonekebitose.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2ce7b3fbe---63885144014.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/23875564125.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607119a2e8730---kapujeku.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c52a04c09d8---samuvaziwosuzetovudofi.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/94187564712.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/66213529254.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160881adaa4a16---loxevajulepugemibukisal.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18286031d7---xinijaxew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608382751280d---duzumugorikatavuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=session+rating+scale+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/02d7226b92ba6fcc08448369298e1ae9/zumejovedutik.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_off0000eb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 18800 bytes
SHA-256: 1ac7afd3e6e32ae9caa750d4c8745b6ebe6ceb915ad481597f7d467603fd58bb
font_01_sfnt_off00011c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001345e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345E 10868 bytes
SHA-256: fa8bc6f88a0b7d8aa865d166b998f86f5067502c52f6b9f8b3c4c006ca175f63

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