Malicious PDF — malware analysis report

Static analysis result for SHA-256 531d6b221c37124b…

MALICIOUS

PDF

84.2 KB Created: 2021-06-26 03:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 624d8dd744ffe0241c2d721fd85727d7 SHA-1: 5ad8b7c72007dc21af37e8e5aeb6dd888a59dac5 SHA-256: 531d6b221c37124bbff4d6003f1e726f5a804fe9b70217a8c46ed09e15842d8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609219e62d219---nilemadenudagukofoxutal.pdf In PDF document text
    • https://chptravel.ir/data/file/1413334012.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/mezawuzoj.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/kuturikojalowoxij.pdfIn PDF document text
    • http://artospace.com/pics/file/34581092070.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/6mf7drl0206f6ar70qb3tf1hb5/1631773783.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/gukg5a7gg32vqi48q5gt0kj8i6/60786831271.pdfIn PDF document text
    • https://123natura.com/stockages/files/zeduvanewunaz.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/d4b5efc21e6488a0c897e0cd9f15ca55/neniwiwazusitejixigiworan.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/44c8nco2vm49pe0jvugffh35jg/73349525772.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/480d99868b0f38d494073ef93e2c38f7/84391723699.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/6efd369177fee71f32fadff4a624d31c/44778169222.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/wumoturuf.pdfIn PDF document text
    • http://runo34.ru/attachments/file/wabepimalaselimuwukepoji.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/qqak85f15fbgp04bv36gqv5rf4/dukexelezurobap.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/38d582d62806b8234b0a92250bbcc607/64436067771.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/zukiwipaloxijezugunitiba.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa1bed72ec---96536534658.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/jiwudulasubewojir.pdfIn PDF document text
    • http://caramelitos.sk/files/putofukojuzateju.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/290310004706.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096abd9ac165---6082335348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=calculus+motion+problems+worksheetPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE793 11088 bytes
SHA-256: 930e811c32020bdcc22fd303f656fb37226cd3c748cdc6f4967ed6c2aa5b0192
font_01_sfnt_off00010114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10114 16400 bytes
SHA-256: a78d864d617ad1567c403d861f61bf2f351a50a5cdb9f29c449c72a8ed5d5076
font_02_sfnt_off00012b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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