Malicious PDF — malware analysis report

Static analysis result for SHA-256 858e8971860137c7…

MALICIOUS

PDF

87.7 KB Created: 2021-06-29 21:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8750cda28ae59228560cc193410a9fe3 SHA-1: c6d97cb14bcb79e9892b06f3de5388f0cc1f6579 SHA-256: 858e8971860137c7186402c1ce23ed22688bd026a082b4f632d7c3f06b518ec0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/qfn9jin81pm6fbr0si91ajt2ov/xofinewipexaxegozafevepuj.pdf In PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2319cfea6ce8895c5045b2588ff8e522/80417318608.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d8e188264---lipoguwezoxivekisavitipi.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094035599bd0---salek.pdfIn PDF document text
    • http://dhf-china.com/d/files/mumitovekasabupukuzojaxa.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/34329215414.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608043a749f3f---27542587699.pdfIn PDF document text
    • http://strandedtattoo.net/file/46204416525.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/nelotilofitelalakiro.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/d55ab74b0dde4d425e39472fdcb38b8e/97667487308.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160779e023b465---mikeravijuzaliminif.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/447891333.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a300109fbc2---vijarevozixenubuto.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/38359998259.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc9a0efc61---62355637042.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/majeniz.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/5ok8k9dc37fsj27amdhhghbdqo/39067508365.pdfIn PDF document text
    • https://vieclamkythuat123.com/upload/files/vexasulofezoxodos.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081662ff2ce9---dasigavadadigolunobi.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/3736233731.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/puvakozewibegudekuwiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=shrink+cotton+sweaterPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 17648 bytes
SHA-256: f3db8320214b7e1529619c1a48378f3d0b89eef412069d22f2543f94830c7e1f
font_01_sfnt_off00012047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12047 10532 bytes
SHA-256: ae343190de657646e4beb59a3b0d5d3bda7d71234ecc2aa83461efc6b4e4cbbe
font_02_sfnt_off0001384c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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