Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f26a3031fe922a9…

MALICIOUS

PDF

68.7 KB Created: 2021-10-04 11:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1ce4611e91edf61bcde244e5e61d805c SHA-1: 45520d26b9b51c4921d764190d9dfd7cd8940516 SHA-256: 7f26a3031fe922a9a9f0d249fadf6267b223acf6fe545dc09f3952f99c8419f3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external resources, some of which are other PDF files hosted on compromised websites. This suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=seven+deadly+sins+in+order+of+severity PDF link annotation
    • http://globalroomplus.com/bot/ckfinder/uf/files/76987447122.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161343ddc752dc---7365867874.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/e58d12fb117362d7c1e5faf915befdf0/subulivamegiruno.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/buwegitiwuxapebetos.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/mebukowoxitivuvezavufo.pdfIn PDF document text
    • http://swhos.com/upload/files/47496211282.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333403c9f1b---wenivadewokur.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/20498055464.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/77060441065.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/zumizo.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/gigirifofomipaneluziputod.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/botorowemusowonolowumog.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/gilawowibiger.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f7d6e503b6---vasopikekax.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/kezimojew.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20211001084413.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe3acf0a18---julapokudowodavopedirenem.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/10852507670.pdfIn PDF document text
    • http://sjhtractor.com/d/files/22282951628.pdfIn PDF document text
    • http://rsentco.com/upload/file/fenuzose.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/76343719660.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/wewumaxuga.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631532741.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_off0000aec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC8 15000 bytes
SHA-256: 5624381c6a1a1bfaf4088453cb2d0083240818cb91123a8b8633a38f1dee3c0e
font_01_sfnt_off0000d4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 10604 bytes
SHA-256: 97f3bc3284f523610093012f8122bdb421dbe157e5083147d0ba0a94e3fee1a8

Open this report in the interactive analyzer, or submit your own file for analysis.