Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ed0f6e29d57e1f…

MALICIOUS

PDF

69.8 KB Created: 2021-09-29 10:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ed54dcc672810add88b5d30076ad91c4 SHA-1: 0291b00d296b14f8f14160859a196c8f8bd03551 SHA-256: e3ed0f6e29d57e1f3125735d45788bb06879a2208088835947632bfc42875785
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malware. The presence of embedded URLs and the overall structure indicate an attempt to trick users into downloading potentially harmful files, disguised as software hacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=youtube+music+hack+apk+download PDF link annotation
    • http://varadimasszazs.hu/uploads/files/84334062384.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/21386399417.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613229748057f---muxumegisox.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/99482407057.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/sotujopiwagidotenez.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/92153423407.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/dusuta.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/47348662403.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/betivadaranapid.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/jivom.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/23263132754.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/rewesekunuvaviduvakagej.pdfIn PDF document text
    • http://strandedtattoo.com/file/30302102010.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613042ccdeb7d---revopojatusam.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/sivojizapedifilibomire.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161414476546cd---6899526423.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/vagazikaduj.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/23876963156.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/63290698660.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/1298504667.pdfIn PDF document text
    • https://promise-land.com/upload/file/moxisibavepawilivujizogu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/25769207494.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/takex.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_off0000b0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E2 15196 bytes
SHA-256: e3e972838961b1263d897318162a3dda02d0b5317f653c593b4182fd54eb4a27
font_01_sfnt_off0000d797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD797 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 11080 bytes
SHA-256: dad3c6fe4cef647d2e6c13c8f111b05383b4cc3c1827dde763e2d60047cc9dbc