Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee895334b8e0438a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 07:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2dbfffcb0cabd509f2aceb68aed21a04 SHA-1: b38f2b85b2dad0254ea382a5e791ec653c46db9d SHA-256: ee895334b8e0438a883fb4ed03d5d99930d8b6777f21406aa161034840289c1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised WordPress upload storage and disposable hosting. The embedded JavaScript likely serves to execute malicious actions or redirect the user, while the link farm aims to obscure the final destination, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://topas.lt/userfiles/file/97391066695.pdf In PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/giwibumojirilopiwar.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/zigemovulaxomizetumani.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e0bb0819cfa1e1321a7ee1ed41e46478/vokepikiroredaxitaxe.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/75598290196.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/pitojiweropuzitov.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/ranezoti.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/25943545925.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/sumufugekexiwefifat.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7cf6005c64---nixozirazarizeguzejeda.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/bt97f27v85jch8jvmeuspl4h19/16771726055.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a407470e35---dowowasebazoxovomed.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/nidumixosug.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/29074570394.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/paludefosudes.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/9bd54a048c1bbae6b7ffc681dfb344ba/47305155515.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/79715221529.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7178f7e350286c6360d07cd5444e90ff/rimowizalapode.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/supevi.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/3cfa51b9bf924fb82731a5f260961cbe/dogarixafurufojevekonir.pdfIn PDF document text
    • http://lagrupacio.cat/file/karudusupixanuwaxi.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/69500268024.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/rukewot.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/77105346442.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/dimanikeniwazopigi.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/11476745878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=aschenputtel+pdf+englishPDF 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_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 18920 bytes
SHA-256: 2b42b8eedc0a79b71d0421308ba9b63b9c21faf66b9dd41472190230af2ea952
font_01_sfnt_off000112d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D4 10600 bytes
SHA-256: 1ff0b01335a4773b50e5e5a65d0ac7a4fbccd84cb8084495d8cb8a4dec3121cd
font_02_sfnt_off00012ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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