Malicious PDF — malware analysis report

Static analysis result for SHA-256 675d3fd9d5b35d29…

MALICIOUS

PDF

80.9 KB Created: 2021-09-10 12:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3386953021258b882a021373ce5ff14f SHA-1: 595bf0658b3315b1fc0bce802561b575188643d3 SHA-256: 675d3fd9d5b35d29d58d29c5d42013fc502d56f853ebc1e41b8897d8f8fd0a42
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The embedded JavaScript is a primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=beginning+with+e PDF link annotation
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec4bbe4ad6---79737310519.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/buturovopelosezum.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/jiwutinijeribolebawixe.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/19963188208.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/megiguwobawuguzu.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210901171802.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/17204863264.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/8220388204.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109030845139024.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/renofuboxenavune.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/fanegevexigofulorakub.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/fazulojiborolinuxo.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131331b195b0---tevevabajunekaxef.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/panotape.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/h1j1s18vblr93dvej4s9njnqtv/79771839526.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/1472405848.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/32532464391.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613394659b0be---29962773258.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/bakosalabetegasutewivozi.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/68833355626.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/mifigoxujiliwofatovimapo.pdfIn PDF document text
    • http://uco-kampen.com/media/files/36659429902.pdfIn PDF document text
    • http://dakov.hu/_user/file/zalufawipezixuseleminuve.pdfIn PDF document text
    • https://upaspor.com/resimler/files/73923843045.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_off0000d86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86D 18348 bytes
SHA-256: ac817b371c3238365da40368b535ba8a98864f0f1e24c1f995c390628959c26b
font_01_sfnt_off000107f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F0 9932 bytes
SHA-256: a2bf502a47b39a0efb22722f2e2be7bbe51290f1484891b684ff1b3b6e526ea6
font_02_sfnt_off00011dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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