Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a24b94abec1778a…

MALICIOUS

PDF

99.1 KB Created: 2021-09-12 12:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ef94e319b4b6dfe9f376118b60e1530d SHA-1: d148df72251282512e581ae56794f918d648598a SHA-256: 8a24b94abec1778ae5e5cff2568e0210e140370ed0102c63d039881b74405c57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised websites, indicating a likely phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://smidgel.ru/uplcv?utm_term=pathfinder+druid+feats PDF link annotation
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/dc21c0420711c41fda5e442134a78937/16301356941.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161364ab78c693---78053731741.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/zezezovaludogesixovo.pdfIn PDF document text
    • http://rideco.hu/upload/file/gepuguwipuxir.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135ab2017047---jujuwibavovibimikipovow.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/sawixo.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/58320197772.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/25009634231.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/96825836206.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/rokodedi.pdfIn PDF document text
    • http://tochuchoinghi.org/files/gatidomubegejapibina.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/razipan.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/pimarigodudapo.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/48465609937.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/8649213759.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/pamadij.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133a9b4826c9---78631518525.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/susugulobolezufun.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210902_C0E36DE1F40A64FC.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/fitenofikametezow.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wididovojovadurevofod.pdfIn PDF document text
    • http://rayanchem.com/d/files/pazisepoxosexedodugo.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/79885911124.pdfIn PDF document text
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/tanoxuduzatenononatute.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

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_off00012001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12001 18184 bytes
SHA-256: 191c14f02052dc62e28984f5aaca08c9b0450decd399fa6182943cc5a03cbc17
font_01_sfnt_off00014fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FAB 10388 bytes
SHA-256: 8d6fb955d91787c9f94fd6b3e7e4442b0664abb1fe9c3cf346f0f0fa35c446b5
font_02_sfnt_off00016716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16716 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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