Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef986ad7610dcbd7…

MALICIOUS

PDF

87.4 KB Created: 2021-06-28 09:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 754adac103ec95c69ddb04e4f9f5ed1e SHA-1: 9104a288fe12b2e2513ea2bdc66a846f63e827df SHA-256: ef986ad7610dcbd787fe9c36054d5494672e2d13100c3fa9f71e4c4e9c9b2919
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these external links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/d8657e99b45607714ae457cb7e27a302/13258712696.pdf In PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/kuxuturopomazabujilamixuz.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/8ssph4aji43si671pr9h26a927/60695625135.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6685b98972---31917581839.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/aec087d35d9f892ea01b3ce1ed271ec4/tiwag.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/76834752936.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/q23lp9j37cn5blno175t36f8m9/lakasimix.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/ronepupunasosuriwizog.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f9fd9715---2045799727.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd85a38a851---74860543276.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97b4af2f38---sekuteniwoxevepoxuk.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba47e9abf23---vidojugusixefapapa.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/repisexegew.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6df241e70---fezopulitusapulujodesetu.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/povujuwarotuludi.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaf4066a9a---xuvalivopabupiwapupenazox.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160815a0cdfc8e---30267372056.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/41302156555.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079cf7956e47---sobomizuwososaxinel.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/38bbb4b23c0a36115282466551edd8cf/kuzafirovamidisuliwuled.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/n25lvn141rjdqcoi3n5ob85bg7/56662491480.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/61016636409.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b8c02339f82fd3b0fc73bed5419878fa/62417281610.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abc42de5189---78079539204.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/72253291103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+write+software+manualsPDF 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_off0000f579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 16480 bytes
SHA-256: 96b8c8a85d5ab5a87125c522d39dfafca036e396ab97771d47c2a771c3d2a220
font_01_sfnt_off00012009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12009 10552 bytes
SHA-256: 2df760b81bfa90f10429f540c0dc4820488dadd85d028128a7153c7e8ab1a7da
font_02_sfnt_off00013821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13821 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1