Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb4dd056d095180…

MALICIOUS

PDF

85.6 KB Created: 2021-09-14 13:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 423d4e54d55bae67dd1139643ac64ae3 SHA-1: 9734d20fa62ba0444902f67b75bab6ee995ffeed SHA-256: 6fb4dd056d095180f22583decb54963f3c23977af6684338bf4e07df09b030a1
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of 'utm_term' parameters suggests a potential phishing or SEO manipulation tactic to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://easy-sleep24.de/shop/images/editorfiles/file/zulubivijavor.pdf In PDF document text
    • https://dalycity.com/wysiwygfiles/file/vedebinivoda.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613523ae0688a---mibenejef.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/16897853486.pdfIn PDF document text
    • https://jensbrode.de/files/file/42667318177.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/20685886780.pdfIn PDF document text
    • http://egitara.com/upfiles/files/25208211658.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jomejabufonemofufisetu.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/wonexu.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/jabuxojapijob.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/42971855873.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/16860511332.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/fatobojavixozi.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f79ba35538---nesukerisijajuzozujujufa.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/82992371283.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/kukekejosigupixi.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/gamavur.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/negovikikogisodebomapinif.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612fedfa5aa6d---55013574117.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/6858f08b6c28591050b3cbd4d852b5be/77643487661.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/datoxetewuteverasapakogu.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109120604074020.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/supivizafuzopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=firestick+custom+launcherPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CE 16928 bytes
SHA-256: 4a39a3245afcea4e203f2a8bce6a75a2b4c43f39f5d00eb22b8abf30cc518b9c
font_01_sfnt_off000101ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E1 10664 bytes
SHA-256: 19113665d8ba157ea73bc6e4e63d183d8830ff91e6d3d693f128b243fb0ef146
font_03_sfnt_off0001321e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321E 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878

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