Malicious PDF — malware analysis report

Static analysis result for SHA-256 74896e27dd1d76ad…

MALICIOUS

PDF

82.5 KB Created: 2021-09-15 11:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 37382ca8309e029579715e45a226347c SHA-1: db3e23fe71c756e33c79bd74a286f4106b829d8f SHA-256: 74896e27dd1d76adbb23c1de7c783e7d230625bb7ab8a8ee01fe7861073dcc30
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. These elements suggest the PDF is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://philabc.ru/uplcv?utm_term=pdf+reader+mod PDF link annotation
    • http://educasters.co/ckfinder/userfiles/files/63476063156.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/getogudovi.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138db6a1f419---80521512176.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/vusekinabavonituso.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/28705888685.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/sebamasotox.pdfIn PDF document text
    • http://ombs.ru/uploads/files/wugubomejaruf.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/jawafipafoduvo.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210915142722_bggxye.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/78104826846.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210915_C5DF2BC6B1CD598F.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/2150253479.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136424035703---57038272583.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/72080243090.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/zubizavefovofokoz.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6a39d8e4d---8164151821.pdfIn PDF document text
    • https://andhimazhai.com/images/files/pufapune.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/73866945037.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/fizovisikilidurum.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/vozulegifatos.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/1087949620.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614166ed84ae7---69619340024.pdfIn PDF document text
    • http://robedecreateur.com/img/files/sojativ.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385c66c98d2---lesazagazi.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/22641013766.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/96380515333.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_off0000e3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE5 10008 bytes
SHA-256: be514d47a1adfdecae0584235c263d07603db176b655a4cbf7967b21ffc03797
font_02_sfnt_off0001121a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121A 16436 bytes
SHA-256: e32f405bd5d3691b642da1b0267692ca6b17e4957b1e74c03745986c7b0babfe

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