Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6f181592981879…

MALICIOUS

PDF

88.4 KB Created: 2021-07-03 12:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25ae304e99793c37dd68ce40c824a144 SHA-1: 307ba8a8760c9ad4de5740cb91405a503565f8ec SHA-256: be6f181592981879f08e3718415e07c71e4ea3dde8b6e20ece60130211dcc31e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://nomylo.ru/uplcv?utm_term=great+quotes+from+great+leaders+pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/37f640dabb351e81640ffa8621f35540/sezuvagiziwanowujiw.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160986f6540de7---depijusizu.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c012bc3c05a---62391713380.pdf
    • http://caphegiabao.com/upload/fck/file/29286475698.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c8970c1b410---54845111099.pdf
    • https://majubesar.net/contents//files/1146914036.pdf
    • http://www.buildingmalawi.com/images/uploaded/documents/jezefemufe.pdf
    • https://universal4shipping.net/userfiles/file/77100447410.pdf
    • http://araonline.hu/uploads/file/jajowolukovaluvap.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b095b3b34---fobufijudejipekesusexuj.pdf
    • http://facilitymanagementassociates.com/survey/userfiles/files/mimufujodoma.pdf
    • http://kompletucetnictvi.cz/files/file/wurituduxanovumamokugesag.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7e0d61b63---jupariwezogixuxujinap.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160932fdb6f880---54563779469.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766048d6c40---kaxukakeremufud.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609832cce894f---79780322271.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/cpqpj1jrda3rf8b5itprvehtp4/kuxalizuboxodikumokulux.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf94369392---migezomegeliwafibagexunaw.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a499bc1c2a5---sirebimikodezevufogujok.pdf
    • http://tfh-filter.hu/_user/file/jevigodoxutovolozomeped.pdf
    • http://dr-onesrl.com/userfiles/files/23260532897.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/2u37o6en1nv2lub9q40svgt8ml/wikabu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f85e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 16792 bytes
font_01_sfnt_off00011070.bin
ea0984f846cd4dfbc13d4304d8dd72c943eed5302b3787ffa2aacc0b57d13b2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11070 17064 bytes
font_02_sfnt_off00013c3e.bin
9ead302a4ab50b3361d27e86213979c7bf51220a93d732bcc3cc579e6ecf5bbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3E 10928 bytes