Malicious PDF — malware analysis report

Static analysis result for SHA-256 871664199f0504fb…

MALICIOUS

PDF

84.1 KB Created: 2021-07-23 11:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 4ca7b9e79de657e8f29b19a5a6f971fb SHA-1: f1a084fb8c58e278afe1dffa6ec419728184aa16 SHA-256: 871664199f0504fb177cb5617a2a59f7ec5b2b1329de1acd2a3a90e1ad486d37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the nature of the link farm suggests it's part of a phishing campaign designed to deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b70c483614d---feduveledawadepoji.pdf In PDF document text
    • https://incasur.org/temp//files/85983492984.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b737f7c1650---taxogatatebibotubagofiso.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c3e8872a1---78972647999.pdfIn PDF document text
    • http://carolinaboatclub.com/userfiles/file/xejilemufasinegajoli.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/wutej.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/35792747115.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/qeuonmeqd32b928pbh5tnci350/zelijeketokimara.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b7b71e32b63e6d5fe378b4a7f470d8c4/jemidojijezasozolunoxivux.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073a9f591cf9---jurezono.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f06220ad6fc---viteli.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/zosatoki.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/ec5aorven3kl5qn9lm9t0ia3m0/pefutozitol.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/zovozep.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160797f839c78b---bufuz.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/80952242117.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/zilamuxexutitejize.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/irk1tsk1pldesfee7c9gfscfkh/numegedabisiwope.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/32c0de9c76a1e0c1d585029469fbd1aa/22325390258.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/nusixedadatosobirovezi.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26538d5a9---85574865895.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/a0prp81qjvrakhiekgoi3s17od/logovukajamokej.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a30bbf301---bilopawejewarozofabik.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c900813494---tedivedonasu.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/kazijarosugologelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=army+unmarried+certificate+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_off0000e3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DB 17120 bytes
SHA-256: d76892f1cb63c42e54eca17e0afac240a4ee0393ec499945d9ed18166c13521c
font_01_sfnt_off00011067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11067 10892 bytes
SHA-256: ea11e91e46ae3bb1625d8b669eb804741277a4acca434d2c86045636563b8404
font_02_sfnt_off000129a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1