Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d75d960502bf20…

MALICIOUS

PDF

77.0 KB Created: 2021-09-05 21:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2336f20ccf69ff53df11b8d0e4e6abae SHA-1: 260a1bdcacb69258e5dc87732e0ec80feea0130f SHA-256: 57d75d960502bf203d234cd0816803657907ec1c2f459f037fa6d6296d3fa02d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://acgroupenterprise.com/userfiles/file/99175540501.pdf In PDF document text
    • http://esangsok.com/upfile/files/49687643867.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/mo3bkfrc8bsbqticnqskjgo07j/fexurisasuwitevotawukap.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/palilijipodakejumax.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/3217364534.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/5a94c3304434525447da49164ed40bbc/43237041558.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b45eaf09d67---89398269993.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210818175620053340be0fwi.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c1fef10fc3a9c1a3f2cc7b3f8cab0746/gesixipapakufaxutid.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/20376898264.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/zoririwufaxenetekisasadex.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c157b5891ee---70374291329.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1e69485fd---19097016494.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/10116524711.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/jumuz.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/50497713737.pdfIn PDF document text
    • https://studiorampinelli.com/file/tutekes.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611add25dae43---kibesetarulaxusipi.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/bifewajivukutoxomizaju.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/26952589345.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/65697256298.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/redobidomikufiko.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/16685315799.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b110b8f43e---zamuridapekigawugow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=convertir+fichier+pdf+en+word+trackid%3Dsp-006PDF 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_off0000c64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 17504 bytes
SHA-256: 9c11df3a9f7f154870d1c5b49082955e2574fe103eb523ea16b79c331d1c6ade
font_02_sfnt_off00010b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6A 11316 bytes
SHA-256: ca9603d7475f063e09478d6a8913a199348b92ed10eb1270e2c23b5cc2addbb3

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