Malicious PDF — malware analysis report

Static analysis result for SHA-256 90615c0c33593b30…

MALICIOUS

PDF

86.3 KB Created: 2021-07-09 21:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 48a8be9c1c5ad535453e1835f31bb941 SHA-1: d40b592309f8dbea7ec03ada2d0c76e5102dfb9b SHA-256: 90615c0c33593b30c78324f4edbd187fb26cc3b47a0a55430549e4019aec1993
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, but the presence of numerous suspicious URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://audit-advisers.com/userfiles/file/tuzafesidezowefetunenima.pdf In PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7299bf167---zagarolidurugava.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/424981860aecb72cb5e12eeba833afd6/71924409138.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c3fd833e8---kuziduxelogebudej.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/zuxuxiwezobomuvixeboju.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/85524023851.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/de3e8849c10ccefce5171deb0cd061f0/29614627309.pdfIn PDF document text
    • http://bryanhigh78.com/clients/72554/File/20048854908.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/tirixixukifutexokaviros.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3b1625595e3ce651ac6f08e1ce2f96ed/83938650538.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/878f5328f0240497b94a66bd61dffc11/mawixufo.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcbb6958ba---goroso.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/412e14035d26e15bee7358fe6a38cd81/mokugemukojenura.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/30503325023.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b3314dad9---lalapewagimuwaxosuso.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bc7f8adef---fiwiwuworowegajere.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/3868954881.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/wujipesatobajatowale.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160702e36d34c6---54574493266.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c408e5bd7---movumowasegurosijibufuled.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/burebetoduvoxudedegasib.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c0b36aad---82008551688.pdfIn PDF document text
    • https://ancoraeducacion.com/images/xurek.pdfIn PDF document text
    • https://morabia.fi/images/file/11278956821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=financial+management+time+value+of+money+pdfPDF 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_off0000e883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 10952 bytes
SHA-256: c82bbad24530cca106636e573e26f69e25861de7b693e4999d0584fb02a8a806
font_01_sfnt_off000101b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C5 18660 bytes
SHA-256: 68b995aca927960d21edd20182064324788cae1b67f146bee4a669809b6c3685