Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c90fef6c16dc84…

MALICIOUS

PDF

86.3 KB Created: 2021-09-05 05:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c8f5aa20dc2691991450e7bc8b23c864 SHA-1: 91af75e56569a86a65e0c3265982154ba279694b SHA-256: 07c90fef6c16dc84c1fc70acec37a35734c303d189ccb63ee5a969f8fa58ada0
156 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 0.9974

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://copingconversations.com/userfiles/file/96041472590.pdf In PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/bokojodinotaxukek.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/1th7rr0cjag0b08uf0ev3tdutn/18381068758.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7o7bsblckh9bmf4bt1oacp7cd0/vobiralujitogalipixisesov.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/52010057798.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/demusa.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e7re0f97d428lqa13686ar5gb0/jofodixatiwokabovadux.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/nadafopaxasuwezebewit.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c6d75a7bf---wakowipi.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607790ffb4ca9---merasubiwijoxi.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/5ba09e5cd0371421c9dc043ef4223bbf/27808499178.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/pexuf.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/dogazajokimabafemat.pdfIn PDF document text
    • https://maisonforville.be/documents/file/37834507149.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/11090241122.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/lebaxubaganufupabiz.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/4o4pcul1k5hetrorjte80pjpvg/fozofuwifaderemewuvevo.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/1vj4qcup8s40taj9kohjr25297/35910989216.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/2d4da031b6174f4e58af0283bedfe4ea/rafelexi.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210820101320.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/49325501025.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202108230914088251.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16117edfc396cb---bubukulewufezafiwatuxikig.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abfa9195d47---25253175486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=multiplication+practice+worksheets+for+3rd+gradePDF 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_off0000e980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE980 18416 bytes
SHA-256: 1e37d6727fc9a585fa1f7b3de0866da1ee7ce7b0012f7a12dc7a9b02fa3a6882
font_01_sfnt_off000118b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B8 11344 bytes
SHA-256: c7aa920c13b27efeb1d0d5de8eb3c92482f78cac91e3326cdccb9bcafa3ce7f2
font_02_sfnt_off0001334c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1