Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb78a0f0d4820ed2…

MALICIOUS

PDF

92.9 KB Created: 2021-09-08 02:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ba93f522dd5d43823209ef37a3491d6 SHA-1: 2bf3587ef72886460f866b2416d2f4ef905b341d SHA-256: eb78a0f0d4820ed2fd7323cd928cdaaf6f9115daef26327b5dee0e82948ff175
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The file's structure and the nature of the URLs suggest it is used to distribute further payloads or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/fomilevotu.pdf In PDF document text
    • https://infrastone.com/userfiles/files/pipomariregu.pdfIn PDF document text
    • http://cjatkinson.com/userimages/85204707548.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/73474721812.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/68596078918.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/40848167631.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/48158675478.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160806fdeb963d---nesivusizuvavalewewozafok.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/17172912740.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/woxitevotudewawafejap.pdfIn PDF document text
    • https://clove7.com/userfiles/file/vogatosozajeloga.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/jafamigagelakijuto.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae2fc9b2b---82850918153.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/74af4e52639d9afb18a65b6fe2420de4/84346946890.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/f58e17135746c3923d59f8e443af06ec/wekevux.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f5cabc2b5---14379619894.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/56274590728.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b391cc15632---49168314130.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160e74cb7a90b1---91954565917.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/23740939964.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/tpd5j5cdf31n6tol008152hju7/91679152514.pdfIn PDF document text
    • https://proxus.nl/file/jovumodaz.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd17d5bd256---65944022256.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/7453293631.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/renulawepepisot.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/6jum5i91tt1jr2ujvv1umahh35/51261423768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cambridge+dictionary+of+literary+terms+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_off00010061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10061 19204 bytes
SHA-256: 579039b653a8e2e31fada4baacbcb2f693a3fa4b03b67f75c630bf6f34fc1dbd
font_01_sfnt_off000132db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DB 11248 bytes
SHA-256: e4f0380a17b6299852f15d6e8c7c18ad6dcd50cb358b2bd0b39e2c870978fc29
font_02_sfnt_off00014cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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