Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7628defa3bbe4af…

MALICIOUS

PDF

86.8 KB Created: 2021-07-02 00:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 8956ab74a50564fef5ad0ee23bfb4172 SHA-1: b0f2c67900b6b69fbf4fa481f1ba4a7042264fda SHA-256: c7628defa3bbe4af715a4f9ec542d8c2c67670e26a48bfdf56d68e5f8df4f032
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to phishing pages or download further malware. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' finding strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://auf.vn/wp-content/plugins/super-forms/uploads/php/files/munl1jpmd2lse15m9m0biccfk2/2951496484.pdf In PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ac8da552a29146e2ddc66b6599eff34d/67510100546.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/9v31mh869rt4lpg9d67ogoqj1l/67259765446.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/crra1h61nva73qnfdanmun6177/72647527402.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/86d583b80442d048f0d8c8d830b96dc2/sijunituxekafabamipab.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16079dc18b8a15---sinafujafopukinenetasisa.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/rufajiwedewugu.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16f4614c66---kiliguvelojizexuxufixenig.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5c85c56de---19632859039.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2308bc912108598fe42443c3590fb74c/sezizigirebon.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/126e92456db5b0ff8def90c0b1115043/pofedozonod.pdfIn PDF document text
    • http://armanetti.com/images/gipidisufuluwi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4ff097ad24701e4f25e473b0cecf5e8a/mulumi.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a548d312d57---8889760304.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/gaifc3607mf23rhpr8r2srvalc/73754684080.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/33571547346.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b21e2ec7788---23283791473.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/tinedeloxexo.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/76057194912.pdfIn PDF document text
    • http://runo34.ru/attachments/file/rozedanuxatekupavoweza.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd46fa6f33---mikixewixeraperesumom.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b330f4c7b1e---tenejetofavawosumubufi.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/walenemerivajoxepamok.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/29601430093.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/cbf402b64af8d4aa300e66acea081295/zesapikotareke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=social+science+class+9+notes+pdf+downloadPDF 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_off0000eef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 10840 bytes
SHA-256: 36397c0e408606294fd268460f048cd839442abb5530dc56cfa9abb9672d367e
font_01_sfnt_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 17324 bytes
SHA-256: 3994a63d26fd189727fca1ed2854bc1607d2aa5cea3851b66980ded5ba827009
font_02_sfnt_off00013594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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