Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13f0ed8547ea49f…

MALICIOUS

PDF

77.3 KB Created: 2021-09-06 04:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6f8894768477210e5b6ea7ab1f58e1d3 SHA-1: f542a9f69e64fb561e2dcfec140bca77e57359e8 SHA-256: a13f0ed8547ea49f1b1d755f275721bd16911024a8892f86cfe2f4fd77f8eee8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to drive traffic to external sites, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://smidgel.ru/uplcv?utm_term=battle+of+brunanburh+poem+pdf PDF link annotation
    • https://lasanisports.com/files/podopimasaveso.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/22861994858.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160881a3fbf458---36319609471.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-28/20210528145602520731.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/gns3hmrrg1tt4q2uv21ia19p70/wonoguw.pdfIn PDF document text
    • http://farashimirooz.com/files/votozefikakipibamavopupi.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16114c33049086---fuvapazukubapivivedit.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160737fee99dc0---razuvimusum.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082e9f538bb1---71111677532.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/wovut.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c17ed59b33b---mezujimafaxibijuferim.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/5bc123a0fde5fced520f32f98741b61b/26417606668.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/88824716711.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e31fdef2bc---32201095540.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/bolekugor.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b56956b1aef---wiboluwizap.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/tokugezegeputixodetu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b6728cc1e---23245855243.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/tewirarigexo.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/54478772649.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/19874269617.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/7abeaefb60eac103b68674fa2aada829/tigagazavadexubizusap.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/32680874026.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a048a65cf---22790059616.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_off0000cd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52C 16576 bytes
SHA-256: d2c5321339f1d8ceba544ef6b2d0247df6ac9268209e8df307dcfd3493e10afe
font_02_sfnt_off00010fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA1 10796 bytes
SHA-256: 580cea0974845d200b39b3d7637429ba5da04108e7efa5eee6d9f751589dce05

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