Malicious PDF — malware analysis report

Static analysis result for SHA-256 185007adfba66eaa…

MALICIOUS

PDF

89.2 KB Created: 2021-06-19 02:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 55dfe6472f0c3373e3f870a4f84f4c7d SHA-1: dfeb614266b0a2549c734f2399346b66ac76c086 SHA-256: 185007adfba66eaacf70414232022fa13ae03c7dcbb0ee85beb19b44a13715a3
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 0.9996

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 https://inwebjor.ru/uplcv?utm_term=princess+agents+season+2+episode+1+eng+sub PDF link annotation
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b4859173b---zikuludepetogo.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/b4beefe87491cdd9e5cc8c0cc921a1ff/37650723184.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/67542972024.pdfIn PDF document text
    • https://alutat.com/data/file/95020770591.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/9p4ajdgsntfaob6ekm5f0u5c0h/31317878410.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/afbc04f19b5755c00dafd7c6c1dda0d9/37753038701.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/lnte1jmh4bfg1aj8jgqttansep/barewuvu.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06702578b0---begimen.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/17e28f2cfb1ff38c0f5befb1b8cadbab/gusuxenofafizeve.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/guzodugomekodixusunego.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078ddbf0e42e---simafivobazelu.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/kebazarolawali.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160716df2255aa---74955822641.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/84ce1cdc40756456ebd4d33aa74d3407/tugufazunisuxasexikofejet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012cfa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12CFA 23000 bytes
SHA-256: 46e8a19fb36fa9c96552fcf0d5db05db47bc88746ed8ae95aea518266930909a
font_00_sfnt_off0000de81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE81 6384 bytes
SHA-256: 02819c9cfdf7ff106967869be86b662d2f3e76f588b484228522ddee20e6baa3
font_01_sfnt_off0000f457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 5536 bytes
SHA-256: 92ea33ac0dd723dc90a81d1a1a4ee7366574edba2df0e897a3f01981d46bbafe
font_02_sfnt_off00010732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10732 11260 bytes
SHA-256: b7488708dff5e78da36f9838fc39013c5b8c4eb77fa4b0866728e60282a0040c