Malicious PDF — malware analysis report

Static analysis result for SHA-256 526466f7f7ffc353…

MALICIOUS

PDF

89.9 KB Created: 2021-09-04 21:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8160bb6ef6e30f93cf6de33e08645ab5 SHA-1: 840aee6ffc9db96fb55d80a2308beb6ae20fdf93 SHA-256: 526466f7f7ffc3534615f2cf8b887fbb898f1e8d365d2493fdec9698b58ef280
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains flagged as disposable or potentially compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm on potentially untrusted hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://porpora.biz/imagenes/imagenes_contenidos///52210397110.pdf In PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/mawivobulokafepelupebo.pdfIn PDF document text
    • https://visualarchive.bg/files/peborusanoxa.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/92469845695.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/75025352501.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/kasawubogapufira.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/a56044ae455521f47b853118fdf792e3/fupewufidexavisiro.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/gizivamit.pdfIn PDF document text
    • https://kham.vn/userfiles/file/23148506860.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/dejaw.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/niruvabulofaridozute.pdfIn PDF document text
    • http://zubrcup.by/files/files/13366784818.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/mozebabeluvajanukifa.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/49323090095.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/19429439075.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/6b41bc1b98b6b3659ae5b4d43af35e51/diwejasaxa.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161000e522dbab---86040555856.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/mijaradogoxaze.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b039fcedecd---83289070335.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc178200a3d---4126196926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sagem+fast+3304+v2+manual+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 11264 bytes
SHA-256: 1ab08d601f2a0a2817448315e49e99dd3e8ede2061ee04573fe489e420410ece
font_01_sfnt_off00010a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A10 21092 bytes
SHA-256: 59aa820463fa7f069c2bb085cd4af31c4e85f84efa1ba222f8f924478eacc0fc
font_02_sfnt_off000141ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1