Malicious PDF — malware analysis report

Static analysis result for SHA-256 1582546cf8802333…

MALICIOUS

PDF

86.3 KB Created: 2021-07-07 14:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 7935abbd0430cb7fa695a919ac058680 SHA-1: 8320e37a8ea07c68ec86942b405e16a92fef3251 SHA-256: 1582546cf8802333f75c96a201490c01e918894fc9733d623a278ea844402064
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/034bbbb553ab90c1661601617dae1e34/12191272460.pdf In PDF document text
    • http://nebovsem.ru/app/webroot/files/files/bokeviboseloradiredusuta.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210614184523.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/btpoalist2pfi0hp3sjfthood5/91779819070.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/walotam.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae53b3149e---95015308203.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/39597544344.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078769bb0438---fimebasoj.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5d82e54ef338394fac1ddc69abbce4c3/62627529688.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/lefexojigasi.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8ddfb69e3e6023a7ae4aa861b0353707/fisimawegaserowujazade.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/48db2b032a0d0d9cab16e28bef20e2fe/35068059088.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/gc0npl1hpb32ov3ftgh7fd1ti7/95765245663.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/zituxatojokozefivojifajev.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/zudisawon.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f93bc26fc---tetisudimosepasuxa.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210617_5a9bd.pdfIn PDF document text
    • http://longhornrings.com/clients/0/08/08da48574b41509ac7bedcf2500dc652/File/12246701899.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/vunupujuwodemage.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4861741fc---luvufawitujemiju.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608110e63bdb2---wujumabebozet.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e22321ad7c---mebamebero.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ofg8mejno9r3l8q1n2gqne9nh0/35140431662.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mirosutakuzodulozabeva.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098548c9f785---wizaridopimiw.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/m29pooius2mr5q7vrp92jk9vpo/likov.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/98408946877.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/9d449970b66b81e5b81b33925366d54e/mojal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=deccan+airlines+costPDF 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_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A4 16968 bytes
SHA-256: 827014056b19000a2e02fcc49743d9ee74c49365ac30324bb933dc3173b2a8e5
font_02_sfnt_off000134a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A9 10224 bytes
SHA-256: faeaab6227095df9d7cc43962b94f4508d92b26219c88ea284baa8fa67778105