Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5bbc8e81d1446f…

MALICIOUS

PDF

137.2 KB Created: 2021-06-15 17:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 17d64135378079eb648c71c492267c34 SHA-1: baa6e8b68bc1dac82eb1f270d0fd2c3f90bf8baf SHA-256: 2e5bbc8e81d1446f2a61b40ef4e11ecb64073c5455ed38b1a703ab9fd9e9f72e
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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://irlanc.ru/uplcv?utm_term=buck+vs+gradle PDF link annotation
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088e3850abd6---32773727949.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/539bb02998f75d906c83a1b85dc5e6c3/lasujurojuluta.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d1b66fc8875c0f0b7801023a638fcf2a/rejijo.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/luzatapetej.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/rukibifekalozuxofarasaw.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb56092864c---xovadudatalopi.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/9fb26442aeacc0ed29288ea68fd350db/pupofonotinerumibejiruwe.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac6f6cb79b---sinanogetutifabizoz.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/39574901262.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/6548800203.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab6c84030---96274421436.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7c3d58797---9801179802.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f9b87adf3---vemolawagetirujelot.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/3fjuldidij6fuubd1tkl6c9rgf/36542518335.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/0a2bcdd88d4f49551c362f8d54bb55cc/ferukenitademowavetep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9D 78696 bytes
SHA-256: 5ccb5f6c0b0e840276c95262c4a63db72601caa070b9e5aeb607038cabe87d94
font_01_sfnt_off0001d5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5E4 4820 bytes
SHA-256: 657ba0215f49fc0b06fd74fee031b9f9916d749a6e3ade7dfe92a56415b1b6ea
font_02_sfnt_off0001e65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E65A 10328 bytes
SHA-256: 577832e80d74c7c1b3aa7b07c53a4763cc789b48160f2a788e47728c8f80f0fc
font_03_sfnt_off000209b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x209B1 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361