Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace4e69542ad5790…

MALICIOUS

PDF

69.6 KB Created: 2021-10-01 00:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ecc056981d9591a94807a16e9e8f6961 SHA-1: 1ee4a27891f4f43930dc374b9441b502deb23bcb SHA-256: ace4e69542ad579031b8bbc343e33d130f5a5bec9ae7227fdfb0a0303816db08
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The presence of these links and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://z-i-f.ru/userfiles/file/65298700781.pdf In PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/85287860917.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16134adc98ab69---bujipinatapepedigovovo.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/81087874287.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/11027823888.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/73687444946.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/dovinuvar.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/gebotimakuxuxijaxubuwizan.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615137a178b87---wetafodupoteram.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/wasutusib.pdfIn PDF document text
    • http://rinsacars.com/files/others/poxemevixakebekojaxewovi.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/19775194470.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/nokadiletide.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/tunulepogexidosurisoxepe.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/68589093968.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a5dca900aed9670a0243ba3d7da920d6/ponemofexirejimibuk.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/diramora.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/25540458622.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/91268189659.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd30aa78bf---rekawenepuxorumipuzif.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/96115528777.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/pekimomikovigufunof.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/romukevevomulefo.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///rususokenubeteb.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/vudilavuguso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pubg+lite+unlimited+bcPDF 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_off0000b06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06F 10404 bytes
SHA-256: 6e78df20f191872a250220265595a620451cf259b1ff580ef8983306043a6081
font_01_sfnt_off0000c7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AD 16308 bytes
SHA-256: 175b36d2abef79c6a6f6db10659015310b2a6deef79ee0b5bab2c4b0d125e16f
font_02_sfnt_off0000f0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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