Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ed78dcd87188b1…

MALICIOUS

PDF

112.8 KB Created: 2021-08-10 22:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e74276cebcecfb13436b8d4d8173d304 SHA-1: 834cf629634311dd0a6ba982105ad9801ba209a3 SHA-256: 05ed78dcd87188b1c19e4d7c9f2d35a5ceb9909b75815c3bd57516815bcfc7af
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely for SEO poisoning or phishing. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user consumption but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/02c9040857e7b0b2a826606f8ac12167/tilikova.pdf In PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/al05fhmath9p7i3fg55hcpuqp1/99713006423.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e961afa8---wiwigijudofoxuwatuwetegiv.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/kqlpaak56gc7sis7dcdud7s51f/89483567892.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/vodafaso.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/2r6i6oh0520tc737hros6692sf/72393174083.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a94f17e67f1---44720195310.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e21d4eb79a---tomezivij.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/witevetujuravowo.pdfIn PDF document text
    • https://ienter.bg/files/67955549501.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/zuratoxixijopusoboz.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aadfab87f9---97052957513.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/rarilonobogorinezopi.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/bofixabilosubi.pdfIn PDF document text
    • http://ubest.ru/images/file/mogenabugox.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/likemunavef.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/20360f05ed15ec858c4624027ba19a7e/tudesojixidipe.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a17fd9f59---vutadojudiwer.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/51845823567.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e140043a05---11092336741.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4abb869d0---kakok.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/hthcu0lhkl80ehbg416ki9564t/9242622469.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/posuxix.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102ce8ef170d---pigikajana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+kind+of+intermolecular+forces+are+present+in+naclPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001538e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1538E 11072 bytes
SHA-256: b36ad331e26f472bf7f0c8bcda6bb5314a8f3892b1c197c40d0619445af53b66
font_01_sfnt_off00016d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D23 18132 bytes
SHA-256: 8d270c816d064443fc6972fff4165ffdb459d7206a20e5dd08590afabad9544c
font_02_sfnt_off00019c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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