Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8e3a7900381dcd…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 20:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 92e1c71d71dfb9ba5b3c723bb18c5acf SHA-1: 4c49d7448a6379d329ff1ae1f3fa59876966428c SHA-256: de8e3a7900381dcdb2a84f7419cff9d82e3d134e38ea61d78c25aa673beadc25
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 via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/nd5m2ip8a8c7cs43po13avgdo5/pezunisebugetajebe.pdf In PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/luvakawudaliderifanakigo.pdfIn PDF document text
    • http://fittbikese.hu/files/file/lavanokepidajoredola.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/46089693864.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16078081ed4df7---kiteferejixitodurinudek.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609546cfc2a4c---sepironakulonemifez.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8fec1d7f9---vinotepegova.pdfIn PDF document text
    • http://modern-pro.ru/files/file/natofu.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5f4e46a56---zotaputim.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/266f90cd8f60b94d1f135673047398ff/reput.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/woboputapobaram.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/tusimaxapurosubatetuxabi.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sofowivib.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/0gd5tf260e3hpmn9jbs7pnnoap/51166099885.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a329f4ffb2---lafelewixu.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/45572062995.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ed17bf757---fujofo.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/boranasobatafef.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/29076906915.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/80981988023.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/33643927213.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/2jqi8k2q0n2uokg1r82qhu5h2u/45024732800.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/52787826499.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/20829452846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=european+pharmacopoeia+7.0+pdf+free+downloadPDF 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_off0000d2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B3 11024 bytes
SHA-256: a7c940b8390aaff572e6e583aea8675ffaf8888672d31250661b09ced0c7a7f9
font_01_sfnt_off0000ec26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC26 18044 bytes
SHA-256: bf442d642ffd45708cefe693b589091666b2038816d496da2e2111d00b76a1cd
font_02_sfnt_off00011aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1