Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8ee60b0cfbf559…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 11:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e94ec6675675163710307a00a1cae0ad SHA-1: d5cc7224396720692a21eaa9b39257781dcf6a88 SHA-256: 2b8ee60b0cfbf55927a7e6747a613a841a22d5e0038d253a8d3a496adaf6851e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also features a link farm pointing to numerous external URLs hosted on potentially compromised or disposable domains, suggesting an attempt to distribute phishing content or further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=editores+de+video+para+android PDF link annotation
    • http://pajurioverslas.lt/ckfinder/userfiles/files/jufirudujumuragaker.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/kabilijitatagarav.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/xajedefaruwivojevefonax.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/89789372226.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/xexaponagupelek.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161382cf9eccdd---popizofakoninivaz.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/roluponosoperize.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/9hu7rnfou2ejpsj844i6tl3p31/guruz.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/71931594715.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a403aedec4---debegobapujasusezafaxefam.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/7562601096.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/38540906074.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/lavipofirojufadiregazep.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/74883940185.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/47664702254.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/selum.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/sukasupeligorabazitode.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161315a98887e7---kaxopasi.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/7136c241f0ce4a683d6ca552068874f2/fulonu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c66fa8a112---rafowaxegabixidulo.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_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 18084 bytes
SHA-256: dde029d9dd4b55055a42978230828bb3b10ee907188c9237069f7c64f83c9cce
font_01_sfnt_off0001073a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073A 10388 bytes
SHA-256: a5857408f0bb1095f3d7f566d1cb534be52c3ee24521c5c2e8812588d630b674
font_02_sfnt_off00011edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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