Malicious PDF — malware analysis report

Static analysis result for SHA-256 282d05585a6c6aa2…

MALICIOUS

PDF

89.7 KB Created: 2021-08-04 13:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 90a8ee274ea2e51085ab0c51a4676dba SHA-1: 92bdb53191b5c9bcf0543fded3ef1156476b9b9b SHA-256: 282d05585a6c6aa28ec9a461d473347fc481ec70cca3ebb7492d15cdf3641335
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed 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 0.9947

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://allytemp.ru/uplcv?utm_term=formato+hoja+de+vida+en+word+sin+experiencia+laboral PDF link annotation
    • http://lesmashclub.com/imgUpload/files/21985500420.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d109e9395---miloji.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/ruruvivigibafizewuxabebas.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/25059302602.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210614_06F6BA6D0F6DE68A.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/0614c7823a5e24816a28c304cb656656/fiburesevabuvobikofiwovox.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/fefaduvegetimusopajevujaf.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2701dc20672036007038c0b7d33d2e71/jebaguduzebaluw.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/50280467185.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/fojodukekiwasose.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e57097b365---zawederewedazonekaned.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/6508a70546f3a4c581af175cb452e2e5/69536096575.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/zatorupo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095cc83adc50---27698981950.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16091143b0095d---fobesedajisoxapoza.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/7701175529.pdfIn PDF document text
    • https://people11people.gr/uploads/File/lijegokeketupaforoti.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a8549c3f60b4ca336b5e25e737cba0ac/34148671498.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2369cd02---lesisavisuji.pdfIn PDF document text
    • http://mextro.de/upload/files/jusopedin.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/jaxamefitesozewugufuged.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/44254704965.pdfIn PDF document text
    • http://mobitransjogja.com/files/sixufobirerekodizep.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/263a8d8ba0aa40dbdfb7dbd59a2b53ed/supolupufarenovododup.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_off0000f59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAD 18376 bytes
SHA-256: d6494b917a2a015e7eb2bef558f87ae72bd94ffca20bc4d7188cfbedc0178987
font_02_sfnt_off00013cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD4 11280 bytes
SHA-256: 811717cca91e7496711f3284a778c5a61a1fdbbc9c9ff4e1a62050f6f3e91054

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