Malicious PDF — malware analysis report

Static analysis result for SHA-256 21350392de591582…

MALICIOUS

PDF

86.2 KB Created: 2021-09-03 20:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 54d525a73b406ca9a35309f7b65eacf6 SHA-1: e50c981a9b4c7197643e6090e1e6a6cdd201f101 SHA-256: 21350392de591582a3651615ba79b09d8c327eb82324565bb7f919695ad12d9c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress upload directories and disposable hosting. This suggests the document is part of a link farm or phishing campaign, likely intended to distribute malware or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://dla-pracownika.pl/pliki_user/File/tukiveripetonowuro.pdf In PDF document text
    • http://dotykbylinky.sk/_subory/subory/nemaputa.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/61980091950.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607198294f17e---najazovenifoxop.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/43058140420.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/10ki0oqj48ke737jbuds34us8l/segok.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/5363e279f6ef6d9d19e3675c55ffa427/pivatepevodipalusibujinoz.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607168ed0e364---bumosi.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/banejavexofawigumipeg.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/a61b6d0294b5ef7021471a8974c0cdae/65095623830.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/77476065224.pdfIn PDF document text
    • http://plncse.hu/php_data/file/nujepuwed.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/sonatidebexoxojodol.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/42050749656.pdfIn PDF document text
    • http://lucann.com/Upload/file/jodojixirowivanapexajopo.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/tudarasikolivoxutizejede.pdfIn PDF document text
    • http://hoacanh.net/luutru/files/pigedinesitolalet.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/xitefugowitokepewi.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/17414626428.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef2415db93---suloturolujunarawiku.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/puzojitalo.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/35121764540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=technicolor+router+tg589+manualPDF 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_off0000e9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10203 11080 bytes
SHA-256: 9e55edbd300135cadec6684c5a4472eec9d68ad458eb3bded42f2f91b91444a7
font_02_sfnt_off00011bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBB 18144 bytes
SHA-256: bd59b6c4fb5c3617213715ee9446f8e6254861556b6bc48c7fffe1ad62405e0a

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