Malicious PDF — malware analysis report

Static analysis result for SHA-256 459d9ea4a76829d6…

MALICIOUS

PDF

77.3 KB Created: 2021-09-07 11:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c8944fd0b81a6082082383634daf74cb SHA-1: d5ace9c24ebba3962fbbd7ca8a77a3471bb318c1 SHA-256: 459d9ea4a76829d6de1151c17d527d794465c02fc9126f9ccb26d2beb7dd8097
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=un+migrationspakt+inhalt+pdf PDF link annotation
    • http://mvhs1964.com/clients/2/20/2030ff4f331b14c2016b95997514b7ac/File/72959283471.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/40274011611.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/66787590977.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/kituw.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/labovames.pdfIn PDF document text
    • https://majubesar.com/contents//files/7350693463.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609214d377036---wuzilelim.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/dawimeg.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/bixekujenabumubizur.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e237a4a2ed---zokenazutoponutir.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/xuvatedelutorube.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf22fa0a648---31095912316.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/2971788357.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/aqao58j1v0qr49mkh0564brm77/vipikedipuwaki.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/51656313196.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/0va3fqi4fl41p773lme19gdlam/xewujakojitin.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/3b0d1c71d1ead116ebfcb889561a6347/64928236790.pdfIn PDF document text
    • https://hsse.cl/files/denerotidewabo.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/9281744438.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/5633451557.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f72d27de6---lumokel.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fc89490ba---10782847231.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/38247881006.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3784270eb8dcc13656b014824d0955d8/kototef.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/1232a94198becf77e8e7d2774e67c673/99472217497.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xinesowopututub.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_off0000c788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC788 18488 bytes
SHA-256: e0f14d9a865f93d4612988f5aae5522b77281da4915a1bca77d1aa94f6d8fe7c
font_01_sfnt_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 10912 bytes
SHA-256: f14e6d1008ac3ae9494dd05d3b0a2296883ac4c8f921d0ce9a102112f340c652
font_02_sfnt_off00010f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1