Malicious PDF — malware analysis report

Static analysis result for SHA-256 f804a3146d148d8e…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 04:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b72f8cda7904fe43aaf12a011272b9a4 SHA-1: 5b21fc6820820d1291e1fc4aa34ff2bb2fc54eb9 SHA-256: f804a3146d148d8e6185f8247c8578d9f9ee2ac7589c11a9b4cd11672973a5b0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, which are used to host other PDFs. This behavior is characteristic of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/turutojuwadubuvifo.pdf In PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ba60b6723---68234238143.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/926c85ed1e2d919669e22c12bcb23024/rujotikubugidufos.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/10c5465d8414de93d47829e88ddbdb46/70601329808.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/pineb.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/12953399952.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/putebagisizobi.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/nedadufidosazimisu.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/mhtigm90g4uq3tmtmbljnlt1dv/14263905401.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/22a71f1192ecbb77e6551d8c9208f63f.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/kudubuterelumogi.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86536840509.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/jitoj.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace45c01fd9---94115705997.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d2603fde8a5d06bb877fcc90d829b038/sobivutunavat.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/xivesalovewewodama.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/mnjiqnq6s4lcetkudim54bdi16/togebadobi.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/solupurinubi.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/bojodowototepejabore.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad74930509---rotosasino.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/tinafaburijafaro.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161038c3534086---25329991690.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/61684428481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+parable+of+the+bags+of+goldPDF 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_off0000e70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70D 17496 bytes
SHA-256: c6a4012b4a3ce7ff319cd764713aaef92dab98197c3e059c77d78c2c061867a9
font_01_sfnt_off00011409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11409 10684 bytes
SHA-256: e08424e4135c7487576f3fe6c7c1f4215bb225688c5fbf5e3764921bd2db935e
font_02_sfnt_off00012c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1