Malicious PDF — malware analysis report

Static analysis result for SHA-256 7797a85dce72e107…

MALICIOUS

PDF

72.6 KB Created: 2021-09-14 07:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0a26ca67ae37c57e260b82f36228343f SHA-1: d165ec868087ae679660650655b87e705ef74815 SHA-256: 7797a85dce72e1075d67756e7c62d0548253bc3258fb74c9a80d7f567e04d658
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The presence of multiple external URIs and link farms suggests an attempt to lure users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://kulturazebrak.cz/userfiles/26332599707.pdf In PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/65901877352.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/xufulawox.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/96224118545.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613deca28e762---44267681643.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/gulelunizasexulebutan.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/refosowuxaluzonuwiko.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311408c5f2a---medof.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/navepusukopaditafibizuw.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/lemuzolitekogagor.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c96eeb051f---zofeporatorajepoxuxi.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/40938189861.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qr923qdjpl9g1p5mhl67cmi4kq/gabuberefidegajer.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/32231853921.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/kelejedopeserememabewuj.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/39494854079.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/35417508898.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/2f5d25838afd14b00a4133507a998922/rozilar.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/29419119952.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/35eeda1bec665ac96acea8e18a26c16b/51559941273.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c890f8371f---jodekumowum.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33472540950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=little+big+city+1+modPDF 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_off0000ba70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA70 16596 bytes
SHA-256: cd4475feab4d2bcd8ed31ab7ca12419fd24f6c1361891fe98bf3d773c2fa90a9
font_01_sfnt_off0000e541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 10440 bytes
SHA-256: 7c0b18960512284da95c1762b8023ea6fff7b03baf2dd4c0fdd5354d3a712b07

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