Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cbdc1e211a2e092…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 00:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6948c33b7f82be3e1ac868a90e051827 SHA-1: 58ae35edc14f87953d8380e54957994a2c9417ca SHA-256: 1cbdc1e211a2e0925c3e35ac0616e4cbd06c9560d4487ddac33542d3940df572
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The document contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm. The presence of URLs like 'https://coretry.ru/uplcv?utm_term=open+dialer+app' indicates a potential lure to download or execute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://coretry.ru/uplcv?utm_term=open+dialer+app PDF link annotation
    • http://aj-freight.com/ckfinder/userfiles/files/komuzawupatifeb.pdfIn PDF document text
    • http://alpasol.e-giant.net/upload/files/rizuse.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613def111548e---xuzopazotefigadoranalene.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d60f10cf29---komedolikeseruveligojadu.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/5179770440.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16144257015e7b---gubukugixavor.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/doselozugatarami.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/dawoxemigam.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/tewipomotajezukekiziku.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/37013800706.pdfIn PDF document text
    • https://peterdegendt.be/file/gipimaleresetejagubuxex.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/43821675659.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/22470404447.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/3758185403.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/semibobefug.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe4c36368f---zutafekonipagalafi.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/47708448121.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/vidog.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/85263750783.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/88978335558.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/17b83cc8037ef293c79055a9289c2507/likudituxofubuxonab.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/papofozizotatevekir.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f27c4d7ad6---sujela.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_off0000d757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD757 10024 bytes
SHA-256: b33e5e47049e9b81826a42fe16fe3994ae2c3641f6464eb21a4dcec3334ed94b
font_01_sfnt_off0000eda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 17052 bytes
SHA-256: 3de4361c8838c4482605f1e5a110318f986ce250fcd6122819251f12a0df52ba

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