Malicious PDF — malware analysis report

Static analysis result for SHA-256 43cdfeb0eb4232e6…

MALICIOUS

PDF

85.2 KB Created: 2021-08-10 00:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cb43f2b310ef42258e1b7034cf458b91 SHA-1: 7d5e4d15f3232288c3ac164c708398b1f5dd0a17 SHA-256: 43cdfeb0eb4232e6237ed3a0207dfb6cc1854a21b30849864fc8c41a22c11edf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of a 'Password-protected archive handoff' heuristic indicates a common tactic to bypass security filters by instructing the user to obtain a password for an archive, likely containing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://coretry.ru/uplcv?utm_term=how+can+i+check+the+original+airpods+serial+number PDF link annotation
    • https://agrilaui.com/userfiles/file/50757958270.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075117530abd---44902236837.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/foxudaxevuwutedi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863efe35774---2615719886.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609593b9d83f9---nexakawubu.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/15f86734e7520ca1dae2148189ac9ab9/jikojimozevawokawu.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f862139184---devewetiperezimisedoxek.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160746c3d6c363---rezipoxali.pdfIn PDF document text
    • https://eurotechcorp.vn/admin/webroot/upload/image/files/lesuziz.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f9933da6ee4---70101787633.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16086f7b344bd8---55871218583.pdfIn PDF document text
    • http://armanetti.com/images/gidanuvaveti.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a86101ca8a---51600149816.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/tezebi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/92df2c5424300fc0c8cdca95c42a17e2/76935264621.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/juxukuleluvefiwudewix.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/sapufobepezomon.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/vibuvitetijivuverikok.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/fanuwox.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb0ab93103---dozipozogugovi.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/jekisupilokatewitifaluba.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/puwamatonaxuxu.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_off0000e757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF69 16528 bytes
SHA-256: 0ad5d241db05f30b5faa9ecb2b5fa6a4122cfda02aedcae32d256972946bd2bb
font_02_sfnt_off00012a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A17 11372 bytes
SHA-256: 4cceb6961519a048dd81fbdb201d9b4a41c42b061f68f84e73da9d40e1ef6c02

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