Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8841420191d3551…

MALICIOUS

PDF

87.3 KB Created: 2021-08-25 09:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ac3f532eaa6e253bf9a5a30aa507469 SHA-1: eb4cedd96bcec06fab22849a24f69483692eae37 SHA-256: c8841420191d3551ca1be0c75b954c99d2573ecb02682726033115a8024e2800
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://huntic.ru/uplcv?utm_term=does+inflammation+weigh+anything PDF link annotation
    • https://sfeerweter.nl/userfiles/files/59018017971.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b223cd1ef---19422651927.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/52648328185.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/penokufafenojunenapetu.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746bae2c379---rosonesovupeweg.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/9479799060.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/litukimazisupujopivezoxoz.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fde6e46043---moniforepigopabalapaze.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/28395779924.pdfIn PDF document text
    • https://atl-50.com/files/file/20627988892.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/kopakutabovipitigilux.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/matopeta.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/kokikukituro.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/33657996546.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/vikopijewa.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/zixif.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160879b8b317bf---zutad.pdfIn PDF document text
    • http://www.polni.si/Images/files/nanavi.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/bd37rutr7c44d56ddeepiu7cu0/saged.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/54631632160.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8930d5d3b---fumuwusa.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e1aa411c7---peboropubixulame.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/jexab.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fa65d62e0f7---20078336031.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/40b73d9de1b2964ff429cc5ba6cacf8a/91495184450.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6125a73f0ca3e.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_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 16052 bytes
SHA-256: 423f2a4c5efb497ac9f6dae17d324a2d83ba3c29d6bf23c522000023e63d94d7
font_01_sfnt_off00011d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D33 10760 bytes
SHA-256: 49b897ff48dae67bde7db8d5f69fb1a1ce2a9d6819fb3b0cb2c4ac39263b7d15
font_02_sfnt_off000135d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.