Malicious PDF — malware analysis report

Static analysis result for SHA-256 e34d28b7c4c98f47…

MALICIOUS

PDF

94.8 KB Created: 2021-08-12 07:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 995bf0b53336db0037b6e17e77790050 SHA-1: d2b8d996411f55790ad2839498d8a5605ac3be60 SHA-256: e34d28b7c4c98f47d8bae62fd9c13cf311db14909e2a140ba9c5c3d306bb0f94
176 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable domains, indicating a likely phishing or spam campaign. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, potentially exploiting vulnerabilities or leading to credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://drafthe.ru/uplcv?utm_term=introduction+to+managerial+accounting+solution+manual+pdf PDF link annotation
    • http://artstudiodesign.it/userfiles/files/famutuzimozamukuw.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/dca46bbae84f7a6b53f65314a6de8355/kaxofopaxuvu.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5a457da90---30677925505.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/namesaninetama.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a261e51581---mogobimapazodozodotokove.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb280d9ca7---73118518512.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/gebitugenarik.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/27286379140.pdfPDF link annotation
    • https://toppelletmachine.com/d/files/44634767144.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/rdqn8u1dds98aa54rme9i0sor0/13145719961.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210727125152.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/35911238387.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/tipemaxodesiwevudifamofu.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e3a07455d---guwotug.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a296be0e850---80897585167.pdfIn PDF document text
    • http://ducnhua.com/upload/files/3084196005.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/10671475545.pdfIn PDF document text
    • https://biocoils.com/img/file/tipokenepavazabifiza.pdfIn PDF document text
    • http://brukbet.com/user_images/file/9129620679.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/48800084953.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b39bc4661a3---rejixokipoxugipeka.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/lanowewademazulod.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/85278406371.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/9967237519.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/64010766379.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_off0001093c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12153 11012 bytes
SHA-256: c193fe09933f75338d32982d8cdbbe8e653d1782dbe9e6f42821fd0c1107c346
font_02_sfnt_off00013ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB0 18528 bytes
SHA-256: 38a1bb84bdb0f1f908f7682bf4bf7317a3988351a1d7da55f7b2d5b71a5a0787