Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6f181d88560e8e…

MALICIOUS

PDF

91.3 KB Created: 2021-09-01 08:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 358c54f13dbbb01fd6186b348954399e SHA-1: a28ab66c2a07e72038a5ae6f422fdfd3047966f9 SHA-256: eb6f181d88560e8e33533a8c33ec5436a7f3770baae6b6d767fd4e85204aae12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://steammining.com/userfiles/file/bejuwale.pdf In PDF document text
    • https://vicotelecom.vn/static/source/images/file/rusebunedetujepafuxu.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9b6879aab12a423eeefa8242268f605c/50151983906.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/c9712abd9a95bbcdd0aaa116cb26ce73/woxegilelopowoteloxemi.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/67573813386.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/10839049909.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/rokabufilugomekafisu.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adecde41719---jelenijafupedixuzur.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2a30f747---84074629914.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/dixenalux.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/zaragemoloxaxuzipaf.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/rusazirokufetatekoga.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/zopupolujewitusu.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1a709dcc1---35643163208.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ninipok.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/82480bdd99b74dd081ea4a4f3388943d/79230191703.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160f0ae96729cf---46819076592.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/66178544012.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/lawufemavu.pdfIn PDF document text
    • http://floraplant.gr/FCKeditor/userimages/file/fizunikufa.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/befotabojixesezus.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/minowineporefoxet.pdfIn PDF document text
    • http://jarosi.hu/files/file/82190240451.pdfIn PDF document text
    • https://cubic.is/userfiles/file/kufavopo.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/6e2b01fdefd8610719b158d98582bc55/97385979365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=magnetic+dipole+moment+formula+physicsPDF 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_off0000f926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF926 19380 bytes
SHA-256: 0a9930e8942c739e6d0d557ec66f80a2a09835e8ebaa249116163eeebaf66309
font_01_sfnt_off00012b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3A 11272 bytes
SHA-256: 560ca7fd4c676e54d1fa11e6a048e8099eac32c6acc5a9fced8aa795986b528d
font_02_sfnt_off00014553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1