Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25b939ad040cca5…

MALICIOUS

PDF

75.6 KB Created: 2021-09-21 17:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 099a30d8dabd4f763c754f7db21cef29 SHA-1: e0dac466bd1be74b980f87ad2132c6912725ae3c SHA-256: b25b939ad040cca50364c73e889dc1ad2fbf8bda336f1bef4df7a75bb46806a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised domains or are part of a link farm strategy. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. While no scripts were directly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://artin-intranet.com/ckupload/files/remitokijuwa.pdf In PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614893cd6967b---guxore.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/dobijala.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/77381688966.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/tuzabidewasixokaz.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/diranegakunijopemo.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5cfeb1199---88531163072.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/98965606043.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/sovinubuzu.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/f02c1d7b14fd3d7862889b975d3ac323/dajasugodinodup.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/bewowiwiguse.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e74d84e3b7---zirisudamavegopadutelodop.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/lexolozodujamawawu.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/vumironumejodavareted.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/zadigebepinabopagun.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210917121644.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/xamaparixexixe.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/junawurorafodujid.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/78707035647.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/3846699797.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/nosatijazokejafenebuko.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f3e92ea6b---likabekemirugigav.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/bidifo.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/vinomolepidajutik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=101+drama+games+and+activities+pdfPDF 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_off0000c4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0B 10940 bytes
SHA-256: 5c64888d345472c937d377a53ead2bf3c8132239c2b844ef7f3ffc4ab63134a8
font_02_sfnt_off0000f63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63B 16612 bytes
SHA-256: e910253e74a1650f22d87fe2b6335b50b0c80a6c83c3d61a9799107970ecfa31

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