Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5150d3600277736…

MALICIOUS

PDF

72.8 KB Created: 2021-09-27 10:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0b2dc508105d0b54a2c627a652ce2fb3 SHA-1: b4f71e549bbb11f9ad70abe768559aaadd716089 SHA-256: d5150d36002777364fcc415b5059cc21238204d0d8166405c0511b54bc9a698c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://talleresjpg.es/img/file/fufunokekobalewiwodif.pdf In PDF document text
    • http://jfe.hk/userfiles/buxorusiroluguzofojaput.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/jijapawetetakajulatib.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6834edd1caa0f2eddc01e7870bc06115/sufixofopesag.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/wudezugafebijolagisobixor.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/24096268902.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/17742846789.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/sibif.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/92790651710.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/norepegifaxomasasu.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/65028168239.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/musuzegotaba.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfc59e74f7---geweninudajuwatosugiwute.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/laparasip.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/wegavaloburezenu.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/budorotelumikige.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/setupewabezavufibesimos.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/wafipux.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/76118472026.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/48513369502.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/betala.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/jifuxidisineramuruzawi.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/2397319285.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b90e35467---15225616196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+transfer+contact+from+android+to+iphone+12PDF 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_off0000b23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23F 19220 bytes
SHA-256: 0e98d318bc576238c675343b47b9c4fba0ccf29abc4f9f4c57455f6eb60c2df5
font_01_sfnt_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 11088 bytes
SHA-256: 3c703dac4e5829d118859fb3da1bca78f311f7749e2752d1e210753e0561bb13
font_02_sfnt_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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