Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d424a79982170f2…

MALICIOUS

PDF

85.7 KB Created: 2021-09-19 07:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 40a62bf946524ef37c99f577fa19e424 SHA-1: e580a354eee2bff1f8095f577097a04e575272d5 SHA-256: 7d424a79982170f20c1bb4bee582ebfe9069b2847dec28096f02ac33a2b9c690
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of these links and the overall structure strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=use+android+apps+on+linux PDF link annotation
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/tnv0nec1indltgmp0t362v20j6/rugijiputunowaxa.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/90222206460.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/noguzudexakipivi.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/xigusufosaramefera.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/21772968388.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/52544236627.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/zafetado.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bf189336f---sabulesakafovamen.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138ad92c06be---wepologuwunima.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/wizijosaba.pdfIn PDF document text
    • http://erpos.sk/data/files/memebutojujusarof.pdfIn PDF document text
    • https://eguiders.com/uploads/vopokovavunasakilinomebu.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/90296084229.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c27bc50d5c---25093593969.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/35260899882.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/3338089647.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/43544494333.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/pugimetop.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/6521b411da8a5a9f6bd157554e40e33f/dilujajenudimidup.pdfIn PDF document text
    • http://linker-apps.com/files/90689606492.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fda34bd69---1789499916.pdfIn PDF document text
    • http://fnathservices.com/upload/file/17685269233.pdfIn PDF document text
    • http://aminotp.com/upload/files/rinovoterug.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135054cc3d4b---bimonum.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_off0000e9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F8 18056 bytes
SHA-256: 2eda5b3421c9331b92725cf07c67d3a4e9c9b7b153ffe920470dfb6602625319
font_01_sfnt_off000118ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13101 10496 bytes
SHA-256: 450a543beec722a3deedfea9da97f3fb2d1d471a38f9b3712d5bd0834281c53d

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