Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e57e0847c79f866…

MALICIOUS

PDF

81.5 KB Created: 2021-08-21 03:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 411a855e1639181cc176bef2c9efeb0b SHA-1: ce022dce2e9d25f69ef1105c0839e4e3f18c73d8 SHA-256: 1e57e0847c79f866bacfde6eefde89a109186e58cee8f2f429b430e2ee58ae44
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, characteristic of a link farm used to distribute malicious content or phish for information. The presence of these links suggests an attempt to redirect the user to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://steakclubhn.com/campannas/file/vewilobus.pdf In PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d585a852c4---46011724431.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/gogibubi.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4eeb8312d---73188766463.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/97862731569.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/45695534224.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/97815267896.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/51431188357.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/nipevogapatikumetuv.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/90055948750.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/41c231f29b3e222db4f17d27baa6abfd/19779784541.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/32001253951.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/2kkds40bns1hmioet3l8iag44m/24537230900.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/92462589854.pdfIn PDF document text
    • http://accronline.com/userfiles/file/59058470905.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/sutelidiwimo.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/74765688024.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607268c9d50f4---43518867494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=codominant%2Fincomplete+dominance+practice+worksheet+answer+keyPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/fc4c3f74d67ea625a0be68efafb04d6c/35090961855.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_off0000dd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 15812 bytes
SHA-256: 66cddfb9b3b93e3f0e94290ecde6374158e50e74f98788ce2d6efac8072eb0f2
font_02_sfnt_off00011e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E51 11136 bytes
SHA-256: d54b6aad32b6654cb5d959cd88e4676a9f2dd4f787ef9d69bbdf325cb6bd3326