Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fda235755790f12…

MALICIOUS

PDF

75.6 KB Created: 2021-09-16 00:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8f6c9ac485da26704a26d5440b4039ab SHA-1: 7acb45bb21a0afcfd1d5effadbbcb77006cc6126 SHA-256: 6fda235755790f127f923f9012c5b71db5d0336a432859201b91bdf064483fa2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://podlahyadvere.sk/editor_uploads/system/files/kimen.pdf In PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/14788721031.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/8811893103.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/33286499763.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/lizovegekaleleranolorasun.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///11259781654.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/babor.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b14008d4c4dc10f417c2fee706aa2ff8/tigepibupuni.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/11671265494.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/92448463820.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/13196574386.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/zarodofizizevamudanota.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/1886006600.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/13772737234.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/zevutu.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b82af972ef---17888327491.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/dasodevodabunime.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/65757890728.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/15920256269.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/lozudakorokufiliguno.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161425fc11fb06---dotaresag.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/60083767773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=internet+explorer+11+for+android+tabletPDF 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_off0000c2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F2 10568 bytes
SHA-256: 9e323c4cb0335fc44326ac29ab24a938379c8e3629004769e4971b2bc3a94b33
font_01_sfnt_off0000daf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF0 17652 bytes
SHA-256: cf119a6a26fdb3195f1420acec65b8e6741e6faab9ac202e8e93fa473d75ea9a
font_02_sfnt_off0001088e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1