Malicious PDF — malware analysis report

Static analysis result for SHA-256 0682b632c45a2ead…

MALICIOUS

PDF

114.9 KB Created: 2021-06-27 11:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 996f10b1d50a4be197ea0caf1beb7f7b SHA-1: d5c3a2e08d0d0842fcf966d81dedf8edfd50893f SHA-256: 0682b632c45a2ead67ee7063d01fb7fb3de10b7a603ae29c0ed32d1e8622266a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9669

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://catamma.ru/uplcv?utm_term=bengali+meaning+of+dam PDF link annotation
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/9qrb0em91p24m7a6bblbd1puc3/67352744188.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/b2f3f21acf77d4205c71108f6a69b6ca/1588360909.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bbb555aeb---tejoferonorowonifovasaziz.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083b7d6756a5---puvazupizaka.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775bc579d1f---2525309825.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9767e8f311a3832e498a71a9eb75e1ba/mawipi.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/35765329241.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e726f2655---werinutufatavo.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/shgni6vrfn30dfh165ffgjcc3j/lamasovuvafigidilutujaf.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/geridanubalisizakalupobi.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c033bd3277---53090759792.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/27506536717.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/subuxawiruvo.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/mlmgjur15d8hioclvrqoeejk36/ramexupedetavadisajib.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/63140665238.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160926a695191b---15838995437.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/91b678bef0c79724660c6142cafdae98/58756856206.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/55457290546.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a70ab9252---13825348005.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d62560bc59---26159780133.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52be418b6---lazisuvenuki.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d2f7ff2156208e8dbaa3f67cd1167522/22664107001.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/95621752732.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10355 2644 bytes
SHA-256: a4d69c78661d00daf2ca2345433774dcaff71af3314f72bcaf40cb0639509a11
font_01_sfnt_off00010e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E78 10384 bytes
SHA-256: 1c84bceb2d8b28e21b40b809348a900feabf745f951889e7aedf87cbe4530f41
font_02_sfnt_off000125b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC4 19364 bytes
SHA-256: 9913f759f34498af84abdf1c5be60911a4d2df3be784b2bfe657e15d9cf09a8e
font_04_sfnt_off00015f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F52 39136 bytes
SHA-256: bb4df8ff530dd7014811eae7669ed490eca835b43d0588b4fd4bbffc9dffdc4d

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