Malicious PDF — malware analysis report

Static analysis result for SHA-256 087b0f407e443954…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 12:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 00adebe6939c01309fe8c2de9cae36c8 SHA-1: ed5ecba4522cf1bbcc20ea7bde62c468b416573e SHA-256: 087b0f407e443954d55481fc960a5b184cccb37123e3b00d5fb4e81d8d426728
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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://imcborivali.org/userfiles/file/sokosigonovofizefevabewiz.pdf In PDF document text
    • https://groupburuemas2.com/contents/files/52986354940.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/94268300725.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e8e493d41ba6113e83b29ddfb5807285/gosakulub.pdfIn PDF document text
    • http://storemisr.com/uploads/files/9991520603.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/24979911403.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/12833161461.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131626a5d4db---123461180.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/40962287717.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/sadoledizejogora.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210910_11298D9D3F61B2A6.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/13228990801.pdfIn PDF document text
    • http://neteyes.eu/editor_up/79318197488.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/gofubuvisa.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/27810641726.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/37101334373.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/sikikelosebokowip.pdfIn PDF document text
    • http://www.grifin.sk/files/97260732973.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/16805685931.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/42649788328.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/92253852481.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161312b371a792---puxeretuguxab.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/42845141071.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/30984108811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=como+instalar+kodi+en+android+tv+boxPDF 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_off0000d67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE90 17692 bytes
SHA-256: 2d498a5f775fcee7a9463dccb13f656076a81ea3b719590d4ba56c29ed7702f6
font_02_sfnt_off00011be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE5 10840 bytes
SHA-256: fe553c5bcb598a44d786d7e16ff06f9daf06f4df649da2ec1fd257e65e1c2dbc

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