Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5998d1357aab87e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 23:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a637242e479e5a5bbe886d2d72d4fa9e SHA-1: 51b6fb5714d6fe8b53827a432e1602a0262a053e SHA-256: d5998d1357aab87e2c13e4e681d8335afc93a99ec965a78c73faee40f4c67795
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple PDF files hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://ibshop.gr/uploads/_uploads/files/nujezalivovotoj.pdf In PDF document text
    • http://classiccar-jp.com/js/upload/files/77652321164.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/xaxamoke.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/0c6074fd3b7160a60268dc03af236f49/98098067467.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210907172648.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/xazezesagejogamudibikozig.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/49jv06e2l0jihbh4jhgn5ensb0/97166071078.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/90891715581.pdfIn PDF document text
    • http://msiutilities.biz/documents/26310456113.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff10b46da7---84736593994.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/mowaforolirov.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/82555587946.pdfIn PDF document text
    • https://casaalu.com/luutru/files/85096788229.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/5865104138.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/tikekujikozosawokepu.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/jirusuruxidowenarokaja.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/sabanatemigaratobevutug.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gokik.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/76180826836.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/xomazekekep.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/b14thkokjehqrbjmf704ar8jc6/zuxexafufalelivinabaxozu.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/zupizaxexumalebifopitu.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/62415765334.pdfIn PDF document text
    • http://videocycling.info/files/file/pasabetogufewopi.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/90668174607.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/84664637422.pdfIn PDF document text
    • https://argumentua.com/i/file/16482568412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=keerby+mp3+converter+apkPDF 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_off0000d641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD641 16788 bytes
SHA-256: 4d0cd06e47c586cb173e4e2d47f696713f77b9d1de06f27bac8bad8f20f15961
font_01_sfnt_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 10804 bytes
SHA-256: 0849e29b9001845127cbb7b1db6e9633b7878b9fb964dfcf38335b9a58705be2
font_02_sfnt_off00011a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1