Malicious PDF — malware analysis report

Static analysis result for SHA-256 875de4af72b9b3c7…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 04:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9012ac856d9f8a2c207f88862e590619 SHA-1: fc4c37839eeaf1922a3a05b0fa358be7cc338fd7 SHA-256: 875de4af72b9b3c774350525f8718f8f1aa695b8932b7ad040cff1125ad6223a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to potentially harmful external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16145041c47599---tiwifomugefub.pdf In PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b04ec21e8f---lowuxaxaderimegidajamato.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/78253399713.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/14735433363.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210914111019.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/japaralosiverozovewi.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/gixitexurizudopoxavogok.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d843b11aa---72782228830.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/45337607728.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/gileterabomovu.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/13d9a15f8e7a71996e7cbc0c31307a52/67511803037.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136e727ab30f---weloxosas.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/22476393914.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/fevelazi.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/98929669354.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/magekisoros.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/11025680624.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/24598420506.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/vupexezukogaxoto.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/73923044937.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/zotor.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/62586240125.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/10572661995.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/79162119640.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210901124312893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=warzone+cod+points+freePDF 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_off0000d66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 10620 bytes
SHA-256: 89f70fb38d611aedf7458dcea3ac6accb205455af3108ad5281175e4c4e6f5e5
font_02_sfnt_off000106f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F6 19420 bytes
SHA-256: 0e6fa175175c055069c398fd6bbce30e1e48ca4ffba2f20e0d94f06a809e5d08

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