Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf24166e7f9362c…

MALICIOUS

PDF

82.6 KB Created: 2021-07-06 20:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: e53ed80df2b74fc4c0f47cea83aae0ce SHA-1: 42e37d39b87a1024f675854f374579bae3e2848f SHA-256: 8cf24166e7f9362cbae0469304224ad63facc7772d2eea206a73ade62bf8a6d8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters suggest an effort to obscure the final destination and potentially for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ekransamara.ru/files/xekigugibifu.pdf In PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/d79f3407d0fc1deaa461c671b98d8b4f/bulexawokoxosipedorimoj.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/28901123536.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d00695351---wometin.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/rowexido.pdfIn PDF document text
    • http://prof-cosmetics.com/upload/files/rutimumujiro.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/4f3f8540d485b55cbd0341d0166b8571/wosuvigaberuxal.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/545abba9aceb6b877cb57d951d3eb19f/81267507781.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160899ba78f419---riwimubenin.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/uhb0n3vguuj9lguobonhu29r65/wemabemakanipij.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/7638edad19142bdbe61f399f658f3308/42081546235.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b227ceb95e4---wedivunovuvamewopejobomuv.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/3d9d2518da67f46f1079018654c73bf8/bekajajo.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/berumuxijugud.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e4aa28a96---94459038183.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/63827359428.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/d5de6cc7af589b2e5347e3a77cefdef6/38232849425.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f73827f14---negus.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5fa0859206cf57d70978e55aa1377337/waxoxulaxapede.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/4lro8aa8vccociug88pjgdegds/54891823192.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/sufuba.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/0cad60fd977d15918cab64f450fe5784/jexevomazetelizadugi.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/95696070265.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/kifixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ontario+electrical+safety+code+2012+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_off0000e028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE028 11048 bytes
SHA-256: 22e965778999967812d4649778fa803cc633918a58b1be5b6ab580686dedd537
font_01_sfnt_off0000fa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11228 16532 bytes
SHA-256: cdbb0a722b9dc74c1c419aa175567bafe8a6bf9e79ec2c22339b7489e17501a1