Malicious PDF — malware analysis report

Static analysis result for SHA-256 1126277f5601fc0f…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 20:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 00bff0e94a71b35c65bb996b8b847e0e SHA-1: 9c1e660cbde616e73b7594695fb768ba232b8689 SHA-256: 1126277f5601fc0f9ce234ce31ba1cbcd04dd0294080db028d3d1463c4b5adeb
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms, with several pointing to compromised WordPress upload directories. The primary function appears to be directing users to external sites, potentially for phishing or to serve further malicious content, rather than displaying readable document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=the+outsiders+full+movie+online+free PDF link annotation
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfe6fbcf4d---4041625027.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8aee52b00d---zabalef.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/jaxuwiguxul.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e368c5d304---govoxakaxox.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/9854160386.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ebd3c5e5f---waxudaselol.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/nobawupu.pdfIn PDF document text
    • http://mutitar.com/user_img/files/sorimabelabutibafubil.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/gabipide.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/6kfkj5e7srefbdrrve2cjgp4or/51534425478.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16089019cbcd52---72507328211.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/femogunuketirirakuj.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160878eabdf064---gepijafewadovavinidena.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ad147510b2e---87052063628.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/44650136653.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/jujozutifadu.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/7672112049.pdfIn PDF document text
    • http://synhbio.com/upload/files/25036239330.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/lesarogamibewusedewuwun.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/2542966421.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/tufosan.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e0f0041a---danomi.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_off0000e069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87B 17272 bytes
SHA-256: 417da1882d1e3861ed710edf0fb0f9a285b975331965c62f09209767212046c8
font_02_sfnt_off000124a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A3 10584 bytes
SHA-256: 18ce0a37971ad86fc305d688972592b5c84cdd9d969dbf9be60d7d6d7c56823b

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