Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4d5d4c0688436b…

MALICIOUS

PDF

83.6 KB Created: 2021-07-09 21:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: cc06b5b5b29e80fc9b9ed5cfd9603fbf SHA-1: 0ffb3cdd0286e3997267a94f1905060fe4eee958 SHA-256: 1b4d5d4c0688436bd6f73934119dbbd9a11b5c4a21ec65bbe83cd085023013e3
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm hosted on compromised WordPress sites, directing users to potentially malicious content. The presence of multiple links to compromised CMS upload storage indicates a deliberate attempt to distribute malicious files or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbb127965b---26526745555.pdf In PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b67758179---53366654075.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/17764556285.pdfIn PDF document text
    • http://holzweiss.at/76306913140.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083ce8f3034f---judeforureraw.pdfIn PDF document text
    • http://flexicourse.cz/res/file/95005642617.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cc2e50bc9---zovenonu.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/53209394875.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1684b6c310---4950450371.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/bodoxezefigofiti.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/41107190107.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/79340591495.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/pufasufigimawomelu.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/94244114209.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/79537918575.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087db4c4290d---74646561547.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c37924b44da---4390070292.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/62154343114.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/09r5u5hd1kqp0vkfht20bet2k2/67645610987.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d7548fcf0d3d950f3f4708595f27c82b/sunawuridaraxupogepu.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/3966268948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=seeing+flashes+in+eyesPDF 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_off0000e4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE0 16756 bytes
SHA-256: 978071bb16f07cb18a989851beff59ca84d98eb3a1ea9e13fb0d85f7b056a9d3
font_02_sfnt_off0001286c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286C 10364 bytes
SHA-256: cb39c558bd1737530f64aa3a664540e9273998a48c73a47fc5e3b266ca1cc60f

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