Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c565ba8f05aeb6…

MALICIOUS

PDF

76.9 KB Created: 2021-09-06 09:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c1ed13a010ee6e93cfd2ef5a5d0d5ddb SHA-1: 0eb83e37330fbbb22e9ab2d1f9ecdf71478c4502 SHA-256: e8c565ba8f05aeb65d2bb07892d9a7b2cc23a6d5a5409db20cc89a59e70d67fc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. The file's structure and URL patterns align with techniques used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://hanstime.com/userData/board/file/zimiregivano.pdf In PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/zajaxujetesixivosupod.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/08i0eqe3h7pbc0hmta6jitqlgv/nabizodavakovigagenupilix.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/81475d6225c4934bc7a0f9bdee9eaa31/bofaxegol.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/46385429905.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/71650642983.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8571ad9dd6---27378263772.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/rafogovuwegafatomanov.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cbcc54922---dikodanafanutowemekovu.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/57980019327.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5ff92a4da---78934387181.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/6bc9ba49f4133764e1e54484f171db2d/revubawimodapodexerenedag.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/29907321868.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9a6ffea1da745d0f5502557b605d23f1/vafuxogifupisizoma.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/96471788283.pdfIn PDF document text
    • http://chinazzjx.com/d/files/73211089540.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/40521864856.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/weraru.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768d0617342---94289013481.pdfIn PDF document text
    • https://lysgaards.com/ckfinder/userfiles/files/10528240721.pdfIn PDF document text
    • http://tochalco.com/uploads/files/wimaxulujugiditixa.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/13687751991.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/vumegisikim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=histologia+de+ovario+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_off0000c7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DC 10628 bytes
SHA-256: ec57195a77f58a0d863d6d651405dd7bbd6a6da67656109477a021cf37efa954
font_01_sfnt_off0000e01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01A 18020 bytes
SHA-256: 5e166a135bd8632ca7a700592255c28c5c50ad4b3cb4fbf0f517586a2f87c2ec
font_02_sfnt_off00010e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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