Malicious PDF — malware analysis report

Static analysis result for SHA-256 21190c48d95d3180…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 03:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e33fb74fb2485471d8e0ee56525d8c6a SHA-1: 9d9adbce2648adc2cf51ece3fd50fa37732d51e6 SHA-256: 21190c48d95d31809ca6f9639190da17f8561d076656403d581810f68ec301cb
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests an attempt to manipulate search engine results or distribute malicious content through a network of disposable domains. While no scripts were explicitly extracted, the PDF format can embed JavaScript, which could be used to automate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://zenit-npk.ru/files/file/sanipugawej.pdf In PDF document text
    • http://ottotech.center/userfiles/file/98010142913.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098357c99a50---wagokadit.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/91371007700.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/fa3320a00da0a39c72a5e2456b845ca1/dafekadefanadalutasununu.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1bc21b0a3092e3774a6b7a04f26fd8bf/vojunizumoxafo.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1622867092.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/muxutobugitijisaka.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/kusidakejafopike.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/91587748768.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/71468194312.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/jowefe.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/87cf71aaf203e7227af2ed8df90ae2ff/pusaliduwogo.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/34765799004.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/zisisimipamijonadodagubam.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/dotusewidoxe.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xubiwivazevuxo.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1238091168611846cf4a428.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/rexupobadunapivukoxidade.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/50795364590.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/meponapanixinobajelewu.pdfIn PDF document text
    • http://brukbet.com/user_images/file/77284622320.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/66592289121.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8a5205bc310dcf1e558d6571b567366a/fowuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=conclusion+for+industrial+training+report+pdfPDF 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_off0000d30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30B 16528 bytes
SHA-256: fec3a58b866fa5942dd7faad67559bff7085af56e5dcc1f19d08acc992148193
font_01_sfnt_off0000fd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001151d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151D 10928 bytes
SHA-256: 109a3d4ac110a5d20cac42f9309a489ebad0f7b4366152b2f4dd2fd893383ab1

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