Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb20d29d0d003f5f…

MALICIOUS

PDF

86.1 KB Created: 2021-08-16 21:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 843e04affdb1f4bb6e07c4a8208003e3 SHA-1: 01fcfb151806a5e2fadf67519f54e2bd81014b1a SHA-256: fb20d29d0d003f5f2a19f6734d43586ca7688ba3730ac643ffefcd303061e87a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=how+to+make+a+sofa+bed+with+pallets PDF link annotation
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/dc7a56197c84367394319f93e12a3d00/63856068150.pdfIn PDF document text
    • https://tepihtrava.rs//files/5892032021.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118006fe71e5---5489647385.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/42901876875.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/jimutur.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210601060221_5r4sgp.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/89634159113.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/vudofogulumoki.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/sobas.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2bc4788341---nodegesugulazezivit.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c20f385275d---14164433284.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/39501082373.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a4d2c2d80---17393961732.pdfIn PDF document text
    • http://soles2walk.cz/data/file/zewewidixesu.pdfIn PDF document text
    • http://klefmarken.se/upload/file/ramagekem.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021052609444190.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107cfff80652---kekaxi.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/62473877326.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae42dd2d367---64834687122.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/bj2ivbav0n2t9d1ol8j8gaqmd5/81371504891.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/77536356043.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aee604e6a---raxatasiduvidonugo.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/wixorujenadusuwi.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/gutokijobedekimevefumo.pdfIn PDF document text
    • 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_off0000eb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB19 17416 bytes
SHA-256: 954e001e2536ea7aeb7eac9fe125a7b57d64f8bbff03fa3ea5e2dcbdd5cd7ea6
font_01_sfnt_off00011902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11902 10868 bytes
SHA-256: d6ea6c0fc768206839bcb400bedf6fbea6b6f0d02807a7e94f526f2b4d3ae632
font_02_sfnt_off000131ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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