Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c3494563ef5502…

MALICIOUS

PDF

71.7 KB Created: 2021-06-10 11:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a01511773a0fdf68a3740e4503dbc2d0 SHA-1: 44a1686703548dca305ca0ed905f3eba78a70969 SHA-256: 11c3494563ef5502c40b103ba9547dd3b09b1e0c9be4a5b8201818aa4dc6102d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8222

Heuristics 5

  • 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
  • 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://medvor.ru/uplcv?utm_term=ielts+writing+general+task+1+topics PDF link annotation
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc015d50a1---24831729744.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/45775150602.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/egqlb68pl302dekv52nq650563/rasigupotawevegawizolor.pdfIn PDF document text
    • http://aimic.com/userfiles/file/52396502310.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da042d93c6---tuwipivegoliridawokibe.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9a3f72534---44333443193.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/fusitabis.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e8996dc62---foxavogima.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210515110955623.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609135234bcd9---togolebavovales.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/21681f5e2bed2bafaf9a769a5b2f8a3e/61401574445.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/3c65a9c30602e3819d0803ce61da4db7/46687255422.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba83b4d0a---todisenodiz.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/62441652709.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/78486844509.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772bccc3f03---zebibagemomimuze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 5036 bytes
SHA-256: f6722fe5494942faea80a3eb55861a7f56264fa41a44cfd966a9c6aa14fd2105
font_01_sfnt_off0000fefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFD 10356 bytes
SHA-256: 3ee0a612187231fad23ab60952bd9b885421a0e630ffce70738e95e416d4ae12

Open this report in the interactive analyzer, or submit your own file for analysis.