Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d527db9b1e76554…

MALICIOUS

PDF

86.3 KB Created: 2021-09-04 21:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4afe01108d29d1fcb62b24cd46c1a85c SHA-1: 1323ac58c320232bbe129d180501211e444599df SHA-256: 8d527db9b1e7655471d67a07296b84eb8b7f37c8c1086fc2ef04298fd41432d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous URLs pointing to compromised websites, indicating a phishing or malware distribution attempt. The heuristic firings suggest it functions as a link farm, likely directing users to malicious content or further stages of an attack. The ML classifier and ClamAV detection strongly support its malicious nature.

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://infrive.ru/uplcv?utm_term=dolphin+nautilus+cc+plus+automatic+robotic+pool+cleaner+manual PDF link annotation
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608d96ef4a40a---vizegufobevilukifenogiseb.pdfIn PDF document text
    • http://chamdure.com/DATA/files/vebezibexutose.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/79879017155.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612726446f180---82179409929.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/5381600287.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/69716f737ef28a8f7ef1b62519916919/gezobofewunuzopowim.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160725947ea847---bobosomanuxojisog.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/14837992763.pdfIn PDF document text
    • https://aashianarealty.com/file/5117230524.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faf7d4ea627---xedadafogixesibatun.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/fadowanoz.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/18646608735.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/podixip.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/tevikone.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80380204343.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/muwefonasewa.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/69499158160.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/87482635545.pdfIn PDF document text
    • https://msiutilities.net/documents/botaluf.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/q0m0n6ekr8cki1gdipaeidhqin/64467460209.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202108260700126001.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/d1f5ce119084116358e1b35ae1eb2c7c/69436072203.pdfIn PDF document text
    • 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_off0000ec6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 10880 bytes
SHA-256: bd7971b2bff1cde4e279c91910608a1dd157426a4b2bad4c68b22782d7f3c594
font_02_sfnt_off00011d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3D 17556 bytes
SHA-256: 2e9a6309b7cd1542bdf0b0d7e5872485ca6f8671fa55c904eb1a667c17b4daeb

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