Malicious PDF — malware analysis report

Static analysis result for SHA-256 11db12efb9cc9a78…

MALICIOUS

PDF

112.7 KB Created: 2021-09-06 20:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 52cbdf5f2cb97c332b8c42ae387a6878 SHA-1: 6691268573912452ea31bc11f3f58deeb85eb73b SHA-256: 11db12efb9cc9a7836041c2a279e82361243029b1a1b3eaf24257b608f0097a3
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a phishing page or a second-stage payload. The presence of embedded JavaScript (T1059.007) suggests an attempt to exploit vulnerabilities or execute code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://afghansolar.com/userfiles/file/niloz.pdf In PDF document text
    • https://etimes.mn/uploads/files/vipebeba.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/kajasusisivilanaxi.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/nosunixepoxavexejexekugi.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/60744468775.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609b08b55cf42---97411413723.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/99074393985.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607173a5c4d14---sidefuvazadozuwi.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/197c82bd7e44228b0416552c88969f54/nukirapela.pdfIn PDF document text
    • http://statenbracy.com/clients/d/d3/d362857cea7b6c304c7898dd6c6993b3/File/78769591573.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/likedikag.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/95383773700.pdfIn PDF document text
    • http://absigorta.come/file/najadabosofiniweg.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ac543e3a1---75586954884.pdfIn PDF document text
    • http://huiking.cn/uploads/file/161333083251.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/vexeletikakixol.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/afa00c66862692a596eadadc338206d7/jumuzudaxeweziso.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/a0d2afb2e65a55b980d504ea67a26f34/12796194445.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/62323339936.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/2016451538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=progressive+wave+equation+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000137dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEE 20624 bytes
SHA-256: 25f892a8c467b7855191578ac06444089b9802f411f224b38067b774a20e29b0
font_02_sfnt_off00018589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18589 11024 bytes
SHA-256: d14f02a3055f84ecf98ecaec5f2aa66ae38446944753a4b77d4e297a95535d6a
font_03_sfnt_off00019edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EDD 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137

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