Malicious PDF — malware analysis report

Static analysis result for SHA-256 01868ef6a0ee5906…

MALICIOUS

PDF

91.6 KB Created: 2021-08-20 14:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31e64ef82ddd3e8bd403064b9f9b47f6 SHA-1: c7ac9419a060c92b9869c9a29b9b2291ce3939c3 SHA-256: 01868ef6a0ee590686020e1ce32762a88af66a3f9d907d260882db4da2dd3daa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://philabc.ru/uplcv?utm_term=como+se+hace+un+pronostico+en+psicologia PDF link annotation
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84caed8f6d---webinuwafudemukadup.pdfIn PDF document text
    • http://chromatographvials.com/d/files/dagigexoterudabu.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ff79b602203bb2b14ccf045a4aee7120/katezunokefevu.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/4860052860.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/6004694160.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a848f3f0b46---nosepusojibabeb.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/44300705068.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/70172669154.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/negisaguzasepupafo.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/wezeroxokidojivex.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ace4cdb54b45d7f4548f91659527435e/12318870626.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/90762973758.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/82946445234.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc40473327---fubemepaveluleme.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210624155857.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16094078a724e0---34908454371.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/pitulixumezadi.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/29612292484.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/26532134041.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/sejupumilemiwidesemate.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/eaf9f30ee052fa740c72d5ec2adbd7c9/86541450144.pdfIn PDF document text
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/kapozapasutelotuxuxi.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_off000100ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BD 17136 bytes
SHA-256: b9472f52432c96a7e24a5765678702d184b3198e2e2d4203f9027df4dbeed1f7
font_02_sfnt_off00014450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14450 10952 bytes
SHA-256: b480923c05c69ca7ea5944ab0d03a15567fff4d2fd47169ffe56420974a58032

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