Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b52e43949d5edc…

MALICIOUS

PDF

85.0 KB Created: 2021-09-04 17:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0bfdda7b8bdfda76d93be0de5689152f SHA-1: 9907e69bc2f379639ab99ab9ed46334a04ed3d81 SHA-256: 79b52e43949d5edcf534fe782f13a84548892973aa6978d997e8c7007c493bcb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a visual download button and numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a phishing or malware distribution lure. The presence of these links and the ML/ClamAV detections strongly indicate an attempt to trick the user into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pharma-tools.eu/galeria/file/51726023413.pdf In PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/kediratorin.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/temekibokafine.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610b5a1e6d376---78967452233.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cdff12004---54303618728.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6c233b5ec---95894469232.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/10876915329.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/79663064096.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/53417326856.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24774368572.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/buwevamuri.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/32408088050.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607188993af0f---78294060951.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/9kh3qljbpu5ogitvb1h4h0tf13/suzabi.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/90702394704.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c651d481a96---6680405917.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/5b4bcbe37823af9d499932f7393f90b6/goxitafi.pdfIn PDF document text
    • https://avflash.nl/upload/files/sokesaleniwi.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/34716789028.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/7houmonlf8aicl8ksb35kkp729/xetefikubepuv.pdfIn PDF document text
    • http://zuche0551.com/upload/file/87588252890.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/bejogipixazusepulorana.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/mipipujevo.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/11440550944.pdfIn PDF document text
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/57307834276.pdfIn PDF document text
    • http://willbramephotography.com/24022559829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=usa+softball+umpire+mechanics+manualPDF 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_off0000d916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12D 10992 bytes
SHA-256: a40ac1d54b0b62f4d0dffa75fcd63c951be3b85ab2af49b2aef92a8f8ad898ac
font_02_sfnt_off00010a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A43 22156 bytes
SHA-256: ca0da508cbcb091798ecc4dda5f37873f412ffc8f85ac2131cca6676b6800586

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