Malicious PDF — malware analysis report

Static analysis result for SHA-256 99598fcfc84bc6ef…

MALICIOUS

PDF

70.0 KB Created: 2021-10-01 00:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 21295f43cc44e56232f0ed266853e560 SHA-1: 99095939a585b2144dba1a9bfd50d8325dc04126 SHA-256: 99598fcfc84bc6ef8b394cb7bf8dfc1605fef8208af8511bc58e2e4a28ad81c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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 https://oniceh.ru/uplcv?utm_term=good+morning+impress+shayari PDF link annotation
    • https://maffart-guy.com/userfiles/file/28131926166.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/d95a2fb72f48fc066c6fd570d1b1e40f/betijonorapimej.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/wewadam.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/sokazavovuvolipujut.pdfIn PDF document text
    • http://agmapure.com/upload/files/mexibufepatugevine.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/67142977768.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/443975244.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20211001050034_YmFrb25ld292aWdpcm9mdXBleGlsZXp1dA==.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/dobazifapizave.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/vajebasilaxutoxo.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/femoxolivegibusijuze.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/14566069958.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/35621409942.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/13809810950.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/n97v4u5g3jjb1mm55ocadqs543/basovisalikumoro.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/xevemokijodotikuxuwa.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/59435226434.pdfIn PDF document text
    • https://glozorcom.merlak.ru/userfiles/file/segixopakuwijuxudamimita.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/a8ce3ec51d50d2cfc58eb8a69368d41f/86568306943.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/sijar.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210901061326.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/52184706425.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/55331698130.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_off0000ae82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC694 16936 bytes
SHA-256: 0df71abb45f0b0f3b23bc25e54ae75a48c40bbbc1a2a6a7cf0deda2c1e2ef528
font_02_sfnt_off0000f236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 10848 bytes
SHA-256: edc0e872575b641bf42a9f4c39c8bbb25edd76007ea5ccfad199bf2f610b04ea

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