Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be8851f823a29a5…

MALICIOUS

PDF

75.1 KB Created: 2021-06-29 06:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: d0f5eb633707d7f7c630cf78ab0313ee SHA-1: f1c44bff358e8032645d16df89b66183109bc4f1 SHA-256: 4be8851f823a29a53be8c8f01305b7f8097cf57387e16a60aa582676bfbb1649
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself is heavily obfuscated, and while no scripts were explicitly extracted, the presence of external links and the overall detection profile strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://aelma.com/sites/default/userfiles/file/lozivofajoli.pdf In PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/g9d00b8iids4fmv4g7pktpaqhq/gewarutirijeroperuxosal.pdfIn PDF document text
    • https://primer-spb.ru/files/files/71904995213.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/17099850855.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/76e21593a7c3a4246cea2be3fea47fb7/fevuk.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f604958a---puruzedafegi.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/9b3cl15qij8gcse3k0ffsecma1/60519726599.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160776355dd601---52311785386.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2e8d24c11---zetifutokixata.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/zibedewape.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a390b867d2b---49876674100.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/pigomugepegubeto.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/97715156019.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/wizipurabemeba.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608606ef4aa15---galazupunuwugobezupuwi.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/19jh4euinfd5f3erf33169vmq3/20775615874.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b70a4591d---bimetefusin.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4167c39bcd1e505bcfc1804354399be1/82225942506.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/4186759970.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a9c07866e---47709954286.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/pagadososos.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/674ac1e06c78df3da6baf577346fd20b/61338317142.pdfIn PDF document text
    • http://slsnn.ru/content/file/zekunate.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/6n8v02uskdfpfstvbe8ohlup80/daxobikisidabuwe.pdfIn PDF document text
    • http://dzbnf.com/upload/file///65757833459.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/50433364525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=spdf+configuration+of+all+elementsPDF 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_off0000c2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD7 16248 bytes
SHA-256: 82ea13c64a93c619cc9137d067163c7683b93421b810283c42e9ba8a7d75cdae
font_02_sfnt_off000104e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E4 11136 bytes
SHA-256: 678b01942e9c2f2fb00daee943ed977695025e7fb1ed26131387ef9e570bb281