Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50a9bd49d73ca2c…

MALICIOUS

PDF

83.2 KB Created: 2021-07-04 22:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5712b9db2f8f676cec6bc843c157bde8 SHA-1: 47fea0c21d2723ce740863c61ad2edeb3aa8955a SHA-256: b50a9bd49d73ca2ccf20531656735e5335ed61138a8174f44a40b87db9d6c06a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits PDF vulnerabilities or contains malicious content. The file functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites, suggesting an attempt to distribute malware or conduct phishing. No scripts were extracted, but the presence of external URIs and compromised CMS upload links points towards a malicious distribution or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://drafthe.ru/uplcv?utm_term=how+to+make+a+character+name PDF link annotation
    • https://ilexgold.com/app/webroot/files/userfiles/files/93245394817.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/85487014098.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16076942364649---22757638773.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/u7dsal6q4tbj0jeni5e253btp0/42588264686.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b4f9a6260---jotimakasugaxa.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/20643719363.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/wivumevopon.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4ca801fc9---96602427730.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/dopasemisuvojemakoba.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e96803edc---tukaxuvewi.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b9bc360fe3b8ec2439dfbd8d23c2055b/zudobup.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/xaxitowevunapululokupikoj.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/94cdf2c12520f83441c0f87238b7ef9f/jumolasumuzeburaboxu.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021062814153573499.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/97440842769.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/62092261477.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/kidiwelaxerujamenatafad.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/59188211163.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e578837cd---rigelulirefi.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160838b6bd9ca8---rifufux.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adb5e8438b8---zozupuposimevupibip.pdfIn PDF document text
    • http://getem.plfiles/file/8018227533.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/kme2kbl9ips6fomf1c7lb54q1e/zituvamojubuxagokiwo.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/639378d3bd47ee1acba17689c937c8de/18750499586.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_off0000e39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39F 10360 bytes
SHA-256: f865b201ee1ff7c2e514e2aed509aaba8306f148fb9a84658d438753172a0464
font_01_sfnt_off0000fad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD3 17036 bytes
SHA-256: 1589754cdb60b065f4d9d319d14de1c7cca9e96ad82950edebd6eb69703dd6fd
font_02_sfnt_off00012753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1