Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff61135fda4094e…

MALICIOUS

PDF

82.4 KB Created: 2021-08-19 19:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c052fa44b9bcf43a77c3f918f0226f08 SHA-1: a3b87023e2dff1a5d38ec161af95a998226db76a SHA-256: 8ff61135fda4094ece12609f519a12bb27367055eb6a28ec22b52cae68a66d94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://akapacha.com/userfiles/file/17950586354.pdf In PDF document text
    • http://royalgroup.at/tmp/pasavuko.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/zosanovugugovilomuka.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/xijonorimex.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/7588506980.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/26551227176f05cc3f7e7818c9fa0c34/96994651077.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/fivutagufexuxigipeb.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/nitofi.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/81853719573.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/tujefemijuvolugotiwavajer.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/302942005ce1d5ab91beee2c34bc3dde/20600710516.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/filewubulasakasoferiluxa.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/bf546d3e1f5715e04372acac94d66650/lufuxiwunanojagika.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/2qmk5vnvein2ai6uart6utqf91/tonojupateraxunuxogo.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/s0dn7to7165u1a68du0ivlb140/52823598285.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090cce87ad14---zofumisogidalotepejilimoj.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/votonanito.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac644c7c60---tuzotetevod.pdfIn PDF document text
    • https://stopserv.ru/files/file/28078152347.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/texolowarubonozera.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/jowosomolemaped.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dbafd573e20---ditoxatewit.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/tawezodazapunubimibif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=lacto+vegetarian+diet+plan+for+bodybuildingPDF 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_off0000df24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF24 17088 bytes
SHA-256: 47f5061be3464063bf03354bde301e064f90bbf3279d36b9c0beb3e89866070b
font_01_sfnt_off00010ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CB 11004 bytes
SHA-256: ae57fabe3e0ec5393af51fa738b9a592dbb2e86e0ba4a409efb040f634fce2bf

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