Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e24dc90a1a798b1…

MALICIOUS

PDF

100.7 KB Created: 2021-07-13 15:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0679b4631526b5b0ccddcc2d7c912793 SHA-1: 2419937ba1f15d4b2fe96340d35379519750f5e4 SHA-256: 8e24dc90a1a798b146b69204defc770de7950a211e8b9a5a1fd2c7588580a429
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine its function as a malicious redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://inwebjor.ru/uplcv?utm_term=transmission+and+distribution+electrical+engineering+pdf+download PDF link annotation
    • http://ytovietnam.net/ckfinder/userfiles/files/95321109333.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/rebinasuvikopu.pdfIn PDF document text
    • https://np21bellapalermoshopping.it/file/zipekovarewijojobogawa.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/3cc5597105e1476433c761d360bb8caf/manefab.pdfIn PDF document text
    • http://insureacompany.com/userfiles/file/61819761755.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd11f30317---87136210104.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704c8a58d39---32277048186.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/45236325158.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/9541713402.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/winuzakafurisekubamoj.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/95800597208.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/9e7d9b84a989c27068b8dc4bbfe5108c/11854846949.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078698a1296b---58770130923.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/71576005155.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/251387a2b3a27e1c9dd169d3d7452e7d/84205968781.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c65072e65e---gifidotonolizudavav.pdfIn PDF document text
    • https://o-dance.com/upload/files/56969010163.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/q2vmuvot9phiv00g6p1u3kqs6p/35495598788.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/56171414706.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608593faad8dd---rulukel.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec504b46bb2---47679547618.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/a6115635174f10204a11410d10a5f5ed/40687002293.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160735a1c8f811---89595788376.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DD 11252 bytes
SHA-256: 8569d3068e96ed3608f50c1f67ca5bfe793de15e30bc9ec25b4287f728a04d39
font_01_sfnt_off00013be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153F7 17856 bytes
SHA-256: f346f567943737ab1581ce7f4f89738a5db0f6c738aa23bffde87f0cef3cc705

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