Malicious PDF — malware analysis report

Static analysis result for SHA-256 db98652f892b9684…

MALICIOUS

PDF

85.0 KB Created: 2021-09-04 04:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 592e47cad2ed7454c8a43b0ef8b2375f SHA-1: 3b6e088a35cce9a50ab1d57b08930a800b84dfb5 SHA-256: db98652f892b96841a6fadd2ecf76ede1eeedd9b015d5a3ac9ccc7eacee691b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to various domains, many of which appear to be compromised WordPress installations or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://sillajen.com/fckeditor/_upload/file/vizezibekovufuwivumedik.pdf In PDF document text
    • http://extracam.es/app/webroot/arxius/file/72736026565.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/627be70e73b3276d6ee75ab223ba3dd0/peputurasap.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/balujev.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/25257f884d56eb90bbf012008a506db7/85877191419.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/wewexagasiriderawupevazev.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/giwufewivafolidekunitivok.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/fulib.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/0jbpv47ee88raff99i1btplbrm/97453502686.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/womuv.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/67363980784.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c750c9e9cd8---konekujoneterukedaki.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/975465347.pdfIn PDF document text
    • http://hongquangled.com/upload/files/19828222265.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16079996212e92---32584539341.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609415abdc605---guzajuz.pdfIn PDF document text
    • http://trovas.com/userimages/neluwogalimiko.pdfIn PDF document text
    • http://stylekd.ru/files/nemawarekenovumedimogavoj.pdfIn PDF document text
    • https://petek.biz/resimler/files/fibuvox.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/jolibezafozawuroxazalipo.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/eebf272a7bb974f98828789b7492c9cb/97318672404.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dfc841515---giposexedudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=excel+vba+create+pdf+and+send+emailPDF 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_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 10952 bytes
SHA-256: 117588dfd2d4d01ce62f888f1262308791d1a12891168352beacc995434665b4
font_01_sfnt_off0000f8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D4 20744 bytes
SHA-256: c7a3b195fc5509f6852e03a0f5e28d3e95bfe82b867066f66f4e844f86136bc8
font_02_sfnt_off00012e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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