Malicious PDF — malware analysis report

Static analysis result for SHA-256 271e2461dd0617e8…

MALICIOUS

PDF

91.0 KB Created: 2021-09-24 05:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f430c7abdc2efd15546ec0305b87a425 SHA-1: bc6621a80b678837e8c159a984dc54c6595829d7 SHA-256: 271e2461dd0617e876ba646fbe0219a184eebf7a0fa6c7acbbe8f0dafb21475a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external sites, some hosted on compromised CMS uploads and disposable domains. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://pet.nfe.go.th/m_site/ckfinder/userfiles/files/vasojem.pdf In PDF document text
    • https://bevasilicones.in/userfiles/file/14345364498.pdfIn PDF document text
    • https://mu3yc792xh-rl1.com/contents/files/xobifesawukazefoxemelixu.pdfIn PDF document text
    • http://104408017.linker.tw/files/62154500196.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/sikorigomotavigo.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/72469755003.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/gusikaxujawi.pdfIn PDF document text
    • http://dd-eng.com/files/files/42468135848.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/358f3eee606c20983130680ec66da221/93719667724.pdfIn PDF document text
    • http://rentaruedas.com/files/others/tarujetowekomibavepik.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/dokoratetamatovifijowig.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16138d2ae0de7a---52414105774.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163133643340.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/41190439780.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/137500e009eb078a5945d4c74dc9d5fb/86455387623.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/8650578369.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/sojunijinizikebuxebefip.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///92287064683.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/41485611454.pdfIn PDF document text
    • http://tinhotsaigon.com/uploads/files/vakug.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/zagufunofodelefuwa.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/2552390517.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2cf195c376a188c47c23f1ea51b5b9a8/bakitenudefitevigixo.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/62901903021.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/16229218755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fast+1+full+moviePDF 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_off000102ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BA 17152 bytes
SHA-256: fecea990f80ead95becb2c489e7c98ea5cfe02b66abaf7fb366fab395171aa20
font_01_sfnt_off00012f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F29 10364 bytes
SHA-256: 22da30287801bbbf38f38931a3cda72c8b898a848d27c169da864bb1588630ca
font_02_sfnt_off000146bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1