Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a527a890892a8b9…

MALICIOUS

PDF

76.9 KB Created: 2021-09-22 17:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 07e188f55461d532f15d2010541e8641 SHA-1: 418e1b5cf2450138b753393ce79736c044b6c88c SHA-256: 8a527a890892a8b90ab150d751ed196f6204fdf29da76181ef35a0b9c1eb338a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of a raw IP address in one URI and the ML classifier's high confidence score further indicate malicious intent. ClamAV detection as Pdf.Phishing.Trojan confirms this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://drafthe.ru/uplcv?utm_term=how+do+i+change+the+pattern+on+my+phone PDF link annotation
    • http://nieruchomosci-swidnica.pl/userfiles/file/tifiledarexewutokogowapav.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/60895330759.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/30797678784.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/96493007805.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210916081646.pdfIn PDF document text
    • https://ibericadearmerias.com/file/getofilavodafotufet.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74578213254.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/taridibiwipe.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/e424bb2c0dcd69c19b87ac240b792592/48422042530.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/6edc5e241a104be240bdba701efdfa92.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/89181765918.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/67907612525.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/duvuranawediteg.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/sasojebanirinow.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/95354894645.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161431b134b0d1---bafar.pdfIn PDF document text
    • http://texmet.pl/userimages/file/20108513239.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/ludovagulibidipus.pdfIn PDF document text
    • https://cubic.is/userfiles/file/lumimonibunaxopapupi.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/nofutadobupagezadal.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/wuxoziwopaxararawe.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/45591317232.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/jepageg.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/mesivokigifek.pdfPDF link annotation
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161337921ea9f7---jixotipiw.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_off0000c7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A7 10940 bytes
SHA-256: a78cdebb8c8da6830f952900acee810efcc9fa710ef685a945d2903f4c6f54d7
font_01_sfnt_off0000e09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09C 17556 bytes
SHA-256: 09088807b1d072d77ea6ed238a68539af038206a1b4647c35d1c4320c4f0bf28
font_02_sfnt_off00010d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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