Malicious PDF — malware analysis report

Static analysis result for SHA-256 a120e4a3fc865512…

MALICIOUS

PDF

79.4 KB Created: 2021-09-04 04:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77d9e95dec4c70d312888cf0eb504421 SHA-1: ed9680f5489e932766572bf2b81ff1db61c9194d SHA-256: a120e4a3fc865512a11eea629455b2d26f71c4c83c9cf134bfa0c78552abefe5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=mysql+download+tutorial+pdf PDF link annotation
    • https://bisnismedsos.com/userfiles/file/dawase.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/vivokepibimesuzuluxojugar.pdfIn PDF document text
    • http://trinkhorn.org/userfiles/11076020314.pdfIn PDF document text
    • https://jin-ji.com/upload/files/tarusatapus.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089befe88356---ronagibimako.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/4bha95p14egkckonakfa1ajte0/fukavow.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210726_63CAA8FD0CA928E0.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/42007488221.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/gimijoxipuvuw.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/lokesuxejujazusibomodejo.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202108210034274875.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/finagujisinuwuv.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/telajamobezipemow.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/kinovurawijig.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/aodjfu0rlm2ltcqd0lf0pj8ov2/zegagikejukisuvag.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/53038519145.pdfIn PDF document text
    • http://4yoga.by/pics/files/50637865936.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/92518580651.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/xetamike.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/78174591778.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/danega.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095f998967fb---patixukalorikararixon.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cb05738718d---rimerore.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/lolodeziwewuvipap.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_off0000d372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD372 10800 bytes
SHA-256: 8bac76a6c821f69ec6eea6425024d184b6ea2aac049513f145985d3cbd9c40e2
font_01_sfnt_off0000ec41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10453 16680 bytes
SHA-256: eb9fb76bc6fde1d98004ca07b4cd54868efa5cd49f36c09fbc4ac1b53369abc2