Malicious PDF — malware analysis report

Static analysis result for SHA-256 15dd7d2c2477f733…

MALICIOUS

PDF

85.2 KB Created: 2021-09-10 05:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a055c49f159c7a7f9b8960021c702857 SHA-1: 803e877b1c87b5af8048a2893d28d58a777306d6 SHA-256: 15dd7d2c2477f73308373eabb66ae4aa4d093b832ec523851d0a77e64a4ad17a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised websites and link farms, suggesting an intent to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://krisoc.ru/uplcv?utm_term=music+backup+android PDF link annotation
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/lojemabujafewewipure.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/64436036263.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/4da6cf4f9648a37a2baf628481383728/bepagusiluro.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/57653272418.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/favenupegiv.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/72557695555.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210908222157176.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322f7685ced---falek.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/boribeboj.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/69710813774.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/somaxopokowefasisiboruf.pdfIn PDF document text
    • https://eclearusa.com/images/file/77055265231.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/zadadefubire.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/bazeramojutexexizi.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/ximepo.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/25935546396.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/67069126543.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/90945719908.pdfIn PDF document text
    • http://cwesp.biz/upload/file/jatijekoxemiwunonogitano.pdfIn PDF document text
    • http://wajl.net/img/file/20219502348.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/fozonosol.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/33784054815.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/tutoritusa.pdfIn PDF document text
    • https://somogyplusz.hu/files/jogugofavelekepimew.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aba34da56e---60369494630.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/21793067857.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_off0000ec1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 10556 bytes
SHA-256: 42bef8c1fa10057070507bd62fa52ae414747882ed8de5374af42895d7697dc4
font_01_sfnt_off00010408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 16480 bytes
SHA-256: d5dfd931140f2542a0add197e9012efc14de877436ea558b87da6401487bb36a
font_02_sfnt_off00012ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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