Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ade5496f5152742…

MALICIOUS

PDF

83.3 KB Created: 2021-09-14 08:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1bb2a1dc3f6c4aa6e80176aca39f6a6 SHA-1: c2f07b180cd2d8772cd94050342830b76c810048 SHA-256: 8ade5496f5152742de333b228cc8cecf33b4266d1d661ef53dab7f0b2b3cbdaf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/68934115948.pdf In PDF document text
    • http://tidomusica.com/uploads/files/202109140507061740.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/gobofoveziw.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/rajolu.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/19229227953.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/xitex.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/pimusixizofuxo.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/77567860992.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/f73891a8e9cfca6c09bc0ce6315d4593/7637708443.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/19745677443.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138fd4fce340---pefoxikirenonaregumu.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/54731832979.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/0ikidnm0s4t3mitj0ednjddroo/dotetazuzuwixisam.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/tisegukimilavesefinamuj.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/tukomasivopudutalinelu.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/16428373318.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/sozovepelifijepuvibitaweb.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/zinudusajiferakazikax.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/pevogikerip.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/linumokapurirazulutedosi.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/boxobetujizogomuvosew.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/66422629317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=natural+gas+live+pricePDF 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_off0000e0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 18144 bytes
SHA-256: 93a9fcfd6709f51c6663a88a95ee18d7e95e8c341395a8af8744ea5aa3e8b7aa
font_01_sfnt_off00010fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D9 10468 bytes
SHA-256: 0eae0e0ccda80d9a5edfedeecdd0b4d810300875b807009393d66421bbff17ed

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