Malicious PDF — malware analysis report

Static analysis result for SHA-256 2277871aaa610610…

MALICIOUS

PDF

86.6 KB Created: 2021-07-06 01:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 45ce37c40ae9b47ba6dc4704a7f98899 SHA-1: 6815efb8db011a560dc8638dabe39f0232c7b7de SHA-256: 2277871aaa61061048ab3b76d5672656e5285e649ae956325fda1cbb19e3e6b8
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites utilizing the 'super-forms' plugin for file uploads. This suggests the document is designed as a link farm to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/59d45lq1adomvfbtkj4fbout5a/dogatusunupixudodu.pdf In PDF document text
    • http://modra-skola.cz/userfiles/file/wikoremedofiboxoxuv.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d686996c6dcd263c5a2d214f5f4e4c56/42343655199.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/t1koap8tfqiie7mfl0o7tdpm25/41207127451.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/42499630840.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/29515893491.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/wetakelobafopofijideg.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/75961999058.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba2fef1141---takolidoge.pdfIn PDF document text
    • http://trhs64.com/clients/c/cf/cfad56e582d93fa9eda51f2516e23bdb/File/16236920521.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b426d2bbdcc---kozetaxudavo.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/jamiloromefujova.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/bbc232da03f04124bee5e4a6aa3d8675/97400988631.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/rawodekobik.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ecd5d660f---fivenekixojawemisobo.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/2jqjod7j7s486q456o5o7jpfd1/72563097354.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ceffdc654493c079f0954ceadcd8cdf4/1180641417.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/33017387924.pdfIn PDF document text
    • https://bachson.net/upload/file/65743475949.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/vudilodiveriwe.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/51mku3l8cbrmrbuof6hmtlimbl/suripobuzadepitos.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c61cd09af73---6943407030.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/co3sauj2ut6b2obgbk2blajr5i/13293560208.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/wagunurabipevuxunatizi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b81d5a97cfb---59163418185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=old+granny+anal+picsPDF 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_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 17176 bytes
SHA-256: f950cab7e9fcb9bc38443d3b270212773026263ad3e45f99836a82bdca1a1af2
font_01_sfnt_off00011d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13560 10480 bytes
SHA-256: 63f9b30233df71a955ebb20f6ea6da46ca3a18396c773518b0eafa4db100cfe0