Malicious PDF — malware analysis report

Static analysis result for SHA-256 25fd69e25814cc3f…

MALICIOUS

PDF

78.4 KB Created: 2021-09-20 21:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 737408d4eb451df4851c0271ecb61f73 SHA-1: 91178a4ae0a1a00f75ef34bd6a053d082f0b60e4 SHA-256: 25fd69e25814cc3f383789a600ada34de1bf7b1128a27388e93a034964a512a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristic analysis indicates it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of multiple PDF link farm indicators and a high ML score strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ilexgold.com/app/webroot/files/userfiles/files/repakukenoxig.pdf In PDF document text
    • http://gleb777.com/fck_upload/file/10119146298.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/kamurukiv.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/neviguvubajobaxefegaxuv.pdfIn PDF document text
    • https://pqclass.kr/imgs/file/nesazeweriwakapaz.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/90b07c6373d22963e921bc2d39ba73e8/18928706485.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/kamabanetaxutix.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/89780818274.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/78034534710.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/nobikevitu.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/33998453614.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/pinawibexilanudid.pdfIn PDF document text
    • http://kasand.com/userfiles/dupovadigajujejesizov.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/varopusulogejixadobakikok.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/sumolovivasufe.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134222c13b0e---xuwuladipupanaguxa.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf9ac6b4de---78035855953.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161430df2f3d31---barad.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/29996909237.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/56295038087.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/donarugaf.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/11633497798.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/41482201186.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/56121967775.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109061520374395.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/zujuvuxigivokofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=goat+simulator+free+online+3dPDF 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_off0000d0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DC 10824 bytes
SHA-256: ebf5dbf947fe86ecfc922d7b581c155e7f569a0177bf5adc5dbf5dfe038e76cf
font_01_sfnt_off0000e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 16292 bytes
SHA-256: 6e337cd112663ffef96a3d8bb7c5652d1572f672d18e2a737828353dc043a3e5

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