Malicious PDF — malware analysis report

Static analysis result for SHA-256 9113b99d5080c127…

MALICIOUS

PDF

70.8 KB Created: 2021-09-05 03:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ba514f34d5d24be5b164d6f9f78c396a SHA-1: 823d781566d88f1ed8bf85bf1f30eab77a3d5f27 SHA-256: 9113b99d5080c1271f0f9c9cf7ab6d79b89a3d258d9fb16f9276ff24085756aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a phishing or malware distribution intent.

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://crewmak.ru/uplcv?utm_term=dem%C3%AAncia+por+corpos+de+lewy+pdf PDF link annotation
    • http://piotrkowska77.pl/zdjeciafile/25604375643.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cee7968d9a4---49795575970.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/xadapekasedojer.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/letuvajuwerejirikemenumig.pdfIn PDF document text
    • http://jn-zhsc.com/upload/vuriruduxibom.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6bd46cae5ef1234f16b0413c20ef0cb5/nolemejeroxixokow.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609136c46804d---bodisixidobowonasaz.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/55337465693.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/48723572245.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/72e90889ceff025d55d6af844120b8d9/47353242780.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f76f9fe800a842c3a89b7477049d9f56/pajoxa.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/76273157828.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/lesifavupetizubukidiz.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/32408088050.pdfIn PDF document text
    • http://domosplast.hu/files/file/70823531744.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b91e4e354bc31ed97e37a1af3104c632/77419368024.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b67c1825eef---84680113471.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/larubininezurapotokod.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a33abb580---jetorupexatawoneg.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/d71c76e2a2efe1a7e1455c3c890e2ad3/siwowepigubogojotuvik.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/82927862007.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/jesedulofalonez.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_off0000b34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34D 11044 bytes
SHA-256: ed5ed78ab154397afb02a8fac5439eebb368363d933a518b7751c7deb7685e56
font_01_sfnt_off0000ccb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C8 16456 bytes
SHA-256: cbd12179f8ed43a873307a4980b52d95ea2cd557db6a028b34415af97ee7490b

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