Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6556f86ca39b27…

MALICIOUS

PDF

93.4 KB Created: 2021-06-26 20:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: d5487d2acb74c6624a3a30156672c8f5 SHA-1: 013543e2684526fb87d60b7ee4bf2f6327d6fc05 SHA-256: 5c6556f86ca39b2710b4cc6f82aea763b7877b2e53d2685e35ae970392509ee8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The embedded URLs are the primary indicators of malicious activity, likely serving as lures for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://inwebjor.ru/uplcv?utm_term=oz+in+blueberry+pint PDF link annotation
    • http://simonide.org/userfiles/file/bodozawefoj.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/65688306271.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/19726064472.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/68296390639.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2f40b96f---veboxamima.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/6moiamj45q5qqdk19473htq2f2/xisolevumere.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d7b1e1e72---81905153073.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/76619895272.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/acdbed4a11fd72d96eb35c156abe0fea/18033732386.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b35b5bccd3f---puxuxitalomizidevasimur.pdfIn PDF document text
    • https://wsbtitan.com/images/file/76237207285.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/70304276037.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/48304655552.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/5388084538.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/goresebonalafunuzes.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e55d356a4---52403688464.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/4d9eac3fa87bb1f0e24a53e71c2ff8e0/81310014138.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080beaab2e8f---xunijapomuxilomunurud.pdfIn PDF document text
    • http://juha.be/_files/file/39935898306.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9fed78al4d0a7sdea8jhqq3mnu/14694777204.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/93948967164.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/3f8da4dc9b3d6e2528da8a9a23a4b6ed/34776792475.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71a4d312c9---16011976198.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/a05pduu61j73oain3u0f3p7mr2/jibotekokokitasub.pdfIn PDF document text
    • 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_off000109da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 10236 bytes
SHA-256: b946894433908ff004cbb27652175a1d3c31d4ccdf2702ab47d6b117ef4f4b23
font_01_sfnt_off000120c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C8 18096 bytes
SHA-256: 1eb03800f9a9024aac1f0353c8e4115d9c1440511f081a6c300deae52c6b2649
font_02_sfnt_off0001507e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1507E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1