Malicious PDF — malware analysis report

Static analysis result for SHA-256 b031f7b497c55145…

MALICIOUS

PDF

161.1 KB Created: 2021-07-21 00:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2152b7b99884ae7f42904edd318ddb23 SHA-1: 3c472824f6376dbdabb16bf6e48cfcb923dfe6d1 SHA-256: b031f7b497c5514588e1b2b3a64ca10bdeeba7f12ba6c270a443ef6fceac96d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9750

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://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd728224bee---wewizozavovepomababegurej.pdf In PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc9473d99d---83501876982.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/94432032015.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/74036904312.pdfIn PDF document text
    • https://tepihtrava.rs//files/xilinitodisamuv.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/29646798753.pdfIn PDF document text
    • http://fxmeat.com/upload/file/0e57d18deea430211074af25db436b45.pdfIn PDF document text
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/bajigidomugun.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071c6859961f---67466467796.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/9022370848.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/16329172480.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/8rirkrntvipps4lqb2qtd321ff/50362162397.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/xanivagi.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mlhbt67300ut4s0f6nrhqmtm9v/60253910272.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/gidaledilokoxutupevowes.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c035ec6fc---nepobuwunoxuvixigugi.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/6093803de12c764641de32f5cead8f1b/pikagepe.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/50973060499.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/karasivowuvusiduremonivo.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bc6c149c6---25039179767.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/dd259921c8057d21b9c78cc7f113ec8f/49915303795.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210511081057.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a28860fcb---tekidisadasoja.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160983e609c77e---24724103654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=can+you+play+zelda+on+pcPDF 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_off00020824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20824 18092 bytes
SHA-256: b2dbb103deb567defd355854389177178457956eec8d6339c676e9cd5c0db081
font_01_sfnt_off00023760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23760 3820 bytes
SHA-256: 579be00311dfa9691a7d7f33c76926ef0b4b00a9f6f7d9408832ca36e5f4cfcf
font_02_sfnt_off0002469b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2469B 10356 bytes
SHA-256: 0b45d9e9e08e25968be4b77194d7bd38660151889ad7d635db36687396e5bcd3
font_03_sfnt_off00025e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25E2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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