Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8c3e922fee752e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 07:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9282446e29b96afea7613406b75ac01b SHA-1: 624cb83e8851457d3703dccbd2203c0e07628be7 SHA-256: 1a8c3e922fee752e2bad466dbfee095e9e228463aad8b4361db8cd36da8d87b0
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a password-protected archive. The embedded JavaScript stream and the ClamAV detection further indicate malicious intent. The primary goal appears to be a phishing or malware delivery attempt, disguised as a document download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/omig36rtq4hgejnt0e9655cbkp/rupokaxujolov.pdf In PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832b7c2230b---wemujofu.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/70545812ae7d5b489086908ef3a66e05/16720792845.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/bibina.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/04645b7c0b4107796caff2c8218bd324/sokarafewifesuwemelowi.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/raxosojamuku.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/3cfee9c50db5fbac09e87f8a50c3b1ca/6419016269.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a796e39f263---35385541839.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/44512696848.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/wevoranexidoruwupu.pdfIn PDF document text
    • http://vhktn.at/images/content/files/428470082.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/suremodaxonore.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/zewekamapobanamavoperaris.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76fc6ea64---35774434600.pdfIn PDF document text
    • http://elitvorota.ru/f/file/dovosiravutofak.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/77011439386.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/467ed683d45916aacd6472b57fe14ed8/tezabupegazop.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a178b76b0f9---21897802629.pdfIn PDF document text
    • http://2440027.ru/upload/file/xawezixovewile.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0a62d1fb8---besidexapibinigofax.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea9e44f6f7---jiripumi.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/9529057007.pdfIn PDF document text
    • http://prestopc.it/upload/file/81822002895.pdfIn PDF document text
    • https://oasis-travel.ro/files/37275214747.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d8a1052bbd83958ae79458452bc7aa8d/tibufuxaxejoja.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e4c5ea024---79977788324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=fusionner+les+fichiers+pdf+en+lignePDF 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_off0000d786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD786 10716 bytes
SHA-256: 6ce9e115a64051d74deef08765ed44f9d831e80ab5e7170b01bc1ec95ba0220f
font_01_sfnt_off0000efbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBF 18008 bytes
SHA-256: 4bda573b9f2e4fc985261bdf66b90a9a8332ebee593145073da4d4fe7c5b4350
font_02_sfnt_off00011d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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