Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3d7a026a0e5d4a…

MALICIOUS

PDF

101.0 KB Created: 2021-06-28 08:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 0963880c4a19338cf9afea88e1bdfd16 SHA-1: 8a6f09ab69fcfc521afba8110ec25be3bf02a037 SHA-256: 4a3d7a026a0e5d4a4ba245b361b6e7986e31f5a8b751e4974219c926f41b6dc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress installations and disposable hosting, suggesting an intent to lure users to malicious sites for phishing or malware delivery. The PDF structure itself is heavily obfuscated and appears to be generated by wkhtmltopdf, with no readable document body content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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://queure.ru/uplcv?utm_term=robust+control+examples PDF link annotation
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088dfa159002---98679900016.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/9762772da71b61fec83342b00cb691eb/10918297785.pdfIn PDF document text
    • http://slsnn.ru/content/file/21172241782.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/01a79aeb7deaffb52beb22ac7fc843c5/nuzusonaluje.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/forusujise.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/12483818749.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/772dfe644f2a5aa886b5e34e8ac38bf3/gozamavidato.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/betorovubekepedagut.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/2fn290hor3oa864g339hfu4di6/47548595381.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/nifonota.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d7de50de0---sumib.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/62889970950.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c082b8ccfc1---xinuxesiwevu.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/91119297e0464a8124d9562fffccee7e/56910513548.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f3f005c2a61c78987a176017c173347f/82872926465.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f1822b986c0b88fc624dd6bdc098dcb8/zubakabuwowaninovefu.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/7n0u3dm17mtkeqnep840m8qaq1/72027844531.pdfIn PDF document text
    • http://benly-carson.com/product/files/peripodivalujifipen.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/lebasojuvixanusinire.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/44cd3dfd2bcbd2354f0720a509ea769e/52313487250.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/d49077b9ea99fffae4b29f2101ec919d/57559121158.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c9991d99---bijepuvorakeribajuzunoris.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/ef2bd8e52c33c48f12913a21f4c8dead/55866519282.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/volonatepaxomuf.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/f6aa5bb67e903cf33da1dbb5b5ca3070/mobugaliva.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/e87e3e2434184067b56bc1a00b69d38a/defabamopifuta.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_off00012a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001422e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422E 16824 bytes
SHA-256: e5292c654f60710dc756bc83772a58a635710a144951ae9ca68ad910c6ec3a23
font_02_sfnt_off00016e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E16 10828 bytes
SHA-256: 41bac642c2760f30e825ff6224f4e9df2b6c74c2598e3192cf6f86de3852edff

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