Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7524b6a0a4e3cc…

MALICIOUS

PDF

165.7 KB Created: 2021-08-11 06:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 21ca8d9d5a7a0256e3cb445d3d1866a4 SHA-1: 6d754d1d151378546ad6c31e6eda5bb97407e391 SHA-256: 1d7524b6a0a4e3ccbc54b7f67e46f73537845e7e1741dfa70ab789f9711d9367
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9516

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://jahanchart.ir/data/files/file/vujuxorunorebiwositazamit.pdf In PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/bf27252ae1c4ddfa122a0621de4d3ad0/tugemilowonifemokevum.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/mizigol.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5ejcevjljtgmai494eg4199s97/90733937439.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff739d09698---rakogufipekidogul.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7fbaac073---21381081148.pdfIn PDF document text
    • http://esejsc.com/upload/files/23098198882.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/6muumucv84dd0ekjikanmahgst/feberof.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/79049682806.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ac185318b4ae0dc1f15405d4b150d214/80317049716.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d54a7b21d6b---vafebiporejobirefaw.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82f5a759a---gekegexusuvajuw.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c280a9624---xuzudibu.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/94698024954.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/turevut.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/58453682539.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104a94a93f64---28201992587.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/29335824285.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ba9aee4bc45c8d86d50d479c3b868c2/pofebiviwumewej.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/xewunusitepupilek.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/25937391037.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/rivefanigisibikuv.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/sorefebesazokila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=consecuencias+del+neoliberalismo+en+america+latina+pdfPDF 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_off000220be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x220BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000238d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x238D0 21144 bytes
SHA-256: 4ad2f70d17e263cc8b2cbb78894361bee3d41ddb97725e655f5e6ef2024915c5
font_02_sfnt_off00026bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26BC4 11052 bytes
SHA-256: 1b1f1c60e2206180ddd7fe456dc45324122336020381821c74374c45b10e5b80

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