Malicious PDF — malware analysis report

Static analysis result for SHA-256 4714a945f045f72f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 20:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6bf8c9689c77bbe3b9e78cd4fce8633e SHA-1: 752da34174857566f2274222466e13786e07780d SHA-256: 4714a945f045f72f344b90159748e29d58d366229f2832edc84db217bf126f88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised or disposable domains. The presence of a link to a PDF file within a compromised WordPress upload directory suggests a potential distribution vector for further malicious content. The document body is unreadable binary data, offering no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=cleaner+for+instagram+premium+apk PDF link annotation
    • https://marwaautorepair.com/nbloom/fckuploads/file/tulilatomor.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/palamegiruvoxawiwupalefa.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/49111019949.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631538698.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/niwefelupubek.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/12680485675.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/53350356144.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/933964639.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/dijusubuvonatizavu.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/bukevifakebeje.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f85dea790d---rimewugasivuxovegopu.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/nunarexowakotana.pdfIn PDF document text
    • http://coolscape.info/images/files/nopijogakijitivowaja.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/60948816595.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc039b43c9---getisetero.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/62097100890.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/69336455707.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/gogolafu.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/wujegupixome.pdfIn PDF document text
    • https://duel.pl/userfiles/file/kudebi.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/6d79f4f0e3710cc1faf35b9790cfcaf8/vupapitawogu.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/janusovetedenipaw.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/99370984211.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/68747223508.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/65537467325.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_off0000e180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 10924 bytes
SHA-256: d0b031c65a56af648cdf9f5f5dc315e6eba6c91c4936ae9fd14ada83f0512455
font_01_sfnt_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EE 18456 bytes
SHA-256: 9d0da99861bd53ab08d60e4c44d378e7fa0dae8bfbed57122d3e3b25a43f9871

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