Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0fea5c302dae449…

MALICIOUS

PDF

87.5 KB Created: 2021-09-07 22:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 81f3b3ab0edc02a30917610922fb8512 SHA-1: a9d93216fb597f4754456f90b3cd0a55ed37b617 SHA-256: b0fea5c302dae4492af9aa68c1dcc1c928b45f1ff63d036dd76119c7d29c90bb
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. The heuristics reveal it contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious files. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://accessiblevehicleservices.com/userfiles/file/27518364581.pdf In PDF document text
    • http://weifong.tw/fckimages/file/linegurexugifodotawata.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02e2c4077e---xesebad.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/20805682713.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a32f4146514---21409981138.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/rixumetisewedazadirozalid.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-8-18/20210818102503572342.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e28c164a5---1622535141.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/28e1c6e05e4d3156f72ea9be17fbc246/20360942253.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/begowanegi.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/zumigimosikixav.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/navakatowedumeseb.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/tadadipefexiluverod.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2d6c7ed848e8fe2920eb5378d070a440/merewinadadodu.pdfIn PDF document text
    • http://benrassam.com/uploads/files/dolupukubetizobedopenor.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/potofofamezuvotudopefusuj.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/a65fc09fd546fcae8b8d990fa6e59468/90078678250.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/japodavatukeg.pdfIn PDF document text
    • https://maria-galland.ru/files/file/28369911862.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/fiwagikaseloveziba.pdfIn PDF document text
    • http://jar-ted.pl/file/50250507312.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/4995b3759224d8d8f6909c72f975581e/loxafebulelero.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/fusuxifomutifelubomuk.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/92200560685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=land+revenue+act+1967+mcqs+pdfPDF 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_off0000eaad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C4 11228 bytes
SHA-256: 4a2ed4c87b3d2c3f4ca6a720ae7db0ab797b8b04dffd41d8aa0881dd06d43514
font_02_sfnt_off00011cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEA 19684 bytes
SHA-256: f3f3f2a56f8531deee751c619eceedc416bec2f775f8e0c69a364b62ddb16f70