Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e19b6a66813513…

MALICIOUS

PDF

95.7 KB Created: 2021-09-17 12:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 862c1f2498149d0ea9f0135792742fb4 SHA-1: 3bd46a0afbdab7947a2c73843ca76aedbe4b7978 SHA-256: a0e19b6a668135135480a1fd7e4f38dcaa4a2264401d6161e3e3fa484a949e4e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a password-protected archive lure. This suggests the PDF is designed to trick users into revealing passwords, likely to decrypt a subsequent malicious payload. The numerous embedded URLs, many pointing to compromised CMS upload directories, further support this phishing and payload delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://reformedgeneration.com/userfiles/file/sufepemibovaneza.pdf In PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c089ca851---wosagosafuwizegowago.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/82762584492.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134efb06143b---67138631531.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/zukitujarariz.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/wugajajurifepodupivogerop.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614115e11d894---56864905048.pdfIn PDF document text
    • http://gioithieu.btccorp.vn/uploads/files/rigomi.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/regunowisobo.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/20074330051.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/gifedojojadetijotukoxeka.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/rodubexotaz.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/83884673838.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/62035178920.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/kewumemegadonemosi.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210909160853.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/14006497354.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/xibiz.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16141379e22c96---bijuseteranokudo.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/gimakiwi.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/99757608694.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/91930035231.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/sepigawema.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/rexazaziloniwubabib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=remove+password+from+secured+pdfPDF 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_off00010c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C41 10740 bytes
SHA-256: a3c9b88f2e4bfaa5b7da7d6a7ea6146910c8f64d48d9aa9e8d71e3592510dd27
font_01_sfnt_off00012510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D22 19872 bytes
SHA-256: 19b382c0186fd6d2f09fa0d0139bb5f7f55277e5a5f8536dba403e2339867b06

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