Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a92eeb5e1aef2d…

MALICIOUS

PDF

92.0 KB Created: 2021-08-01 19:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff61acf497a3e25ea921b96bed6c37b3 SHA-1: 241fde8b297d855588c3cde0f0a97450981a36bf SHA-256: 44a92eeb5e1aef2d31ea9f1d11f863f63e442edce805cd4c32ddd2ef92b9b406
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true destination and leverage compromised infrastructure. The ClamAV detection further confirms its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://coretry.ru/uplcv?utm_term=racine+carr%C3%A9+3eme+exercice+pdf PDF link annotation
    • http://24cvety.ru/upload/files/fuzijoxoratujanexagap.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160746fba5aa8e---30098397440.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/72487899828.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/8p7053ek9nl2iauguu080mrtu5/lugukexajejewugase.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/42867154924.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/rezevuvagewajasobetemapok.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/98789e48c3863a98aef7c808cd4d8ad1/30413834455.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/bediwufo.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/gajelovisopif.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/mituwesetonupalabobep.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021060608590473499.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762e5b7f8b6---donobunutovegarupujob.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/gurefumixuxoxu.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9016357e07---xinapazexibuwezexumesava.pdfIn PDF document text
    • http://aimic.com/userfiles/file/29969323579.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/17ec16bad2bccfd693fcba3bc1d9b363/dinutulexesoneluxile.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/28309717994.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/10435320425.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/58038779055.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/38641095669.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/tdsg8c3pd4o5g8nkdl3a06ol2e/lisibupogojumosalitorox.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/5784551699.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/20177432040.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/87004644264.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/92537930324.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 16092 bytes
SHA-256: 5e4c00560aa92e58ed7893f1d29e19bab1551ecfc1a2d4366013d39ff1dff337
font_01_sfnt_off0000fd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD33 10824 bytes
SHA-256: f1951f19d1c415af5add97479a8cdba3218602e39e4d1b71c9a0197f7661818c
font_02_sfnt_off000115d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 18828 bytes
SHA-256: 3dcd5dc7b87e34ad54be24dbf5467ee9893b5d4ae36a0fb17fafef28457b2b89
font_03_sfnt_off000146ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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