Malicious PDF — malware analysis report

Static analysis result for SHA-256 5596329d2a58b7a5…

MALICIOUS

PDF

93.8 KB Created: 2021-07-19 21:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 0359e8f1a6225d080f549153c34598d1 SHA-1: 0cfa00de47aa4ee6f4351b11090bd01f49653c03 SHA-256: 5596329d2a58b7a5d2f660b4d2dd55a43c9b264318d7aabae75ee2b9575d5938
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9956

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://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/71a274ac106419198607610d4a061046/12370006245.pdf In PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071470cbf9ec---65590612535.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0141f2b11---25945034120.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/15066973687.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/62248683725.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dc08e7a0c1c---gododez.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/63372080625.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/238d133f5c0c8efd61ee613c9e1290c2/45646475026.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16098eed24a06a---zugibofesabokuviteku.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/xuvufipemaxubikuro.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/tajijewikawapogojuwaf.pdfIn PDF document text
    • http://atek-ent.com/upload/file/dogesijituwuvataruzog.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/771669cf4550d00e7da7a567904fb3ee/getikagiz.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/019c9dcf89d79a9f2cf39e031aca4988/nikoxetedugiwajasi.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/sorofirutevumoravi.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/d09a1cdef6b4f335fb839e041ba17d7c/baxarofubejotode.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/59701bd22a34f16f0d69e1ad43351fcd/madazexire.pdfIn PDF document text
    • https://songhong.info/userfiles/file/gotezedudimorewuvon.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/22789002491.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a88723b57e---10733793026.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e8f071256c294eda870768df3cffcb44/valupugugumudivoziku.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1622575411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=american+stock+market+opening+timePDF 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_off000109cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CC 18092 bytes
SHA-256: 13a85f9c413ad324502174701336cf01a3910887a421a07635c30f90b4e5c663
font_01_sfnt_off0001391b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391B 10744 bytes
SHA-256: 48731842458bffa8813c2307b59e2952b24c1a228ba5b761e9a9fb8f199be4f1
font_02_sfnt_off000151df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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