Malicious PDF — malware analysis report

Static analysis result for SHA-256 089b399771ca348d…

MALICIOUS

PDF

75.6 KB Created: 2021-09-15 20:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5d5cd0068086541c4626506dd46a2f1f SHA-1: f50afd1065e68a45f9e505a10cc203322cf5c64c SHA-256: 089b399771ca348d9fee61d102e596461254326bfbf516ec16a6cc1119df5b3b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://oniceh.ru/uplcv?utm_term=prisma+photo+editor+free+download PDF link annotation
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7c69f2660---rulipe.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/66507907088.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210902file///32251270772.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/355d47263edb7781c555a9d19a81112a/xufogovoruxubugavepowe.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109110023121227.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/32814613329.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613df7de5b425---22675780414.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/1218339681.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/gosulojisabixatawunuwi.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/tanosatabi.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/8170491921.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/wobiwavedekadomedewu.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/28737794752.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8638697bfc35e525cb8ed2b6bcc07612/gusavadoguvotivokova.pdfIn PDF document text
    • http://premo.at/userfiles/file/kinuredolipatadiwevidexel.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/35997432816.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/a24fe0311237906ffab8ca4b0ce8484e/lalumimogu.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/55297804492.pdfIn PDF document text
    • http://baoveantam.info/upload/files/52616305503.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/uq0qq71q6niknq9p9pqk42jbv3/13648463159.pdfIn PDF document text
    • http://agmapure.com/upload/files/4766974032.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5c81a6f81---zawiguduraviwupademosop.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_off0000c379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC379 10852 bytes
SHA-256: db153d56806207d0c0142cda3f8dd6a186de368e32f56204f4ae6c1ebc8293ec
font_01_sfnt_off0000dc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 17412 bytes
SHA-256: bcd706b62c8bdda7b3203dd57d6e3a7a4a8240d0ab96d1f0585643bf8e7c9566
font_02_sfnt_off000108ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1