Malicious PDF — malware analysis report

Static analysis result for SHA-256 c876bdb6724c1922…

MALICIOUS

PDF

83.8 KB Created: 2021-09-07 21:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1c14e3ee5959bf299591965165a0fe81 SHA-1: 0aca6f59bbfe0d9e6f8e55d2abb4a941fa810cb0 SHA-256: c876bdb6724c192222a48cbe0b078aa73288131e7c0de8353d65c3ad210702c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=bushnell+telescope+deep+space+series+420x+manual PDF link annotation
    • http://geofer.eu/userfiles/files/66552381871.pdfIn PDF document text
    • http://identik.hu/editor_up/waralokegasobusifaf.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/kodixebeledigogobof.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/mutudosafegufabos.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/14207153911.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/fd178651b9ba6561bd41b74ed2a0f457/59037557102.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/poguledumomokifud.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16078f7f0b8d69---reniw.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160759b8c26ddc---98207252437.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/jomipedamobulaleredi.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611554500f7b1---faxirebepuve.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/binimido.pdfIn PDF document text
    • https://maintogelonline2.org/contents//files/91955296991.pdfIn PDF document text
    • http://ellev.fr/upload/files/gelukixobiganalujefatenu.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210605035800.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121768ea403f---bifenumijid.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/gexezugix.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608edeec90436---97845844025.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817f0b6bf91---bamolewafose.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/80385979172.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/devukuloneve.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d8e7be7d9a26ddf0f108e65138047da/63540973774.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/8623c9112c68e890241cbe1c0246d1c3/napatiburudedolozoretom.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_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 18072 bytes
SHA-256: e3b117146b717675376710cbdfa77feab15984677ef5b0f7eb9c252559995e69
font_02_sfnt_off000126b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B5 11356 bytes
SHA-256: d7bf52c77e95dfdf2d45919499f3223a9830e4506b826af7335850150ad35695

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