Malicious PDF — malware analysis report

Static analysis result for SHA-256 14319ea9ab3782b1…

MALICIOUS

PDF

72.5 KB Created: 2021-09-20 00:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f81a914607bebb4ffb093e96af1dcc9f SHA-1: d782ce9d45999beef990349c5da67968a9c04c6a SHA-256: 14319ea9ab3782b1a70b287b1fb180edd5e5a6322f95da8474e9e74898b65fe5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://tndgdemo2.com/ckfinder/userfiles/files/57775142341.pdf In PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/kuvevusewukaf.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/14480686886.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/vufepumul.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/65565967962.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/83316266346.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/75938481361.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/xaxisulodatapamaxodonuni.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/60522326922.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/55862359730.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/16060859449.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/57536624913.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/86448695260.pdfIn PDF document text
    • https://31app.com/userfiles/file/87754019253.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f13e017b47---92395282988.pdfIn PDF document text
    • https://olterus.com/contents/files/mixawigevapixadinopu.pdfIn PDF document text
    • https://angem.fr/userfiles/file/repafijikesonovemolo.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/845e48e8478452b4a7678adf15cbc0b5/worulidigewomupipogibik.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/temosut.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/davilaxikunelefak.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/12819916025.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/26811097122.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/br5rbe05odb0om3ph42umbuf2p/dudibemoniz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=percy+jackson+lightning+thief+book+pdf+downloadPDF link annotation
    • 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_off0000b722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB722 11460 bytes
SHA-256: 57f4e61765549cd72ca69e4931f5385b673b059d492c988d33fd89ab4b47f2c4
font_01_sfnt_off0000d1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C5 16236 bytes
SHA-256: fdaf2b8ed08ade0f9562be4f13e77439b862805c8bc88f12cb421c5c5fc7e3de
font_02_sfnt_off0000fbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1