Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51a5ddd41845eeb…

MALICIOUS

PDF

84.5 KB Created: 2021-07-01 09:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 103bd079fc67d5120d7c28bd27ba7cbc SHA-1: 578755703e79c4b07f3d91cb792d45469daecc68 SHA-256: e51a5ddd41845eebedc70f6495014d4ececb7900e0b0aba7c2f26b3687526313
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4b3a823e0---65389369304.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e91ae36b5d---sajilaloxejemurunexibu.pdf
    • http://dichvutot99.com/webroot/img/files/84241111713.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/8rvlch70582ql74caj8hpbdp5r/rutarivelado.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/762302db8ac2124ec2c093451314de39/sozofivoxe.pdf
    • http://phannhan.vn/files/usersfiles/files/13135815533.pdf
    • http://czdashan.cn/uploadfile/file/2021050213085273499.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/4e9f3268e20182dafe7d11e6bd4048d2/gonexas.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d41e9b84---kuvoje.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ccb7f59bead34ba99f4a1a06f4ddbacb/nokew.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40ad15a1aa---zewofutonaxutolevuf.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8ce9204ce---79680784192.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/51d6885f20f1c90930f9a292bb34d76b/xodanavug.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/668eb302ceda0f420c7b371e5b8aad54/resupugibalupadav.pdf
    • http://studiomilano.eu/userfiles/files/67020030169.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da9fd4eb73b---napuvamurelixalokobozexip.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/91p0hfecfjcj86mqh1d3b7v3eb/wadufiderujotutane.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/24437f3bf70cba153dc59097cb9e201c/kerarivobaxepep.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79d872b8e---talasulewasiviluluxog.pdf
    • http://www.findvoters.com/userfiles/file/pelilajorasakep.pdf
    • http://doubles301.jp/files/ckeditor/files/87958147042.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/fefdc86f261a534b06c2f03b5b3b5f1d/sumibelatimezini.pdf
    • http://china-zzld.com/uploadfile/file///2021062515040977.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c627b360c6b---nanaroxifaxoxuxijibefus.pdf
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/jezunasagu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=bud+spencer+terence+hill+best+movies
    • 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_off0000e599.bin
be3860a480e5bf11cfb979e9748192990a0f21f38f0705f9837239eccd0cf47d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE599 17752 bytes
font_01_sfnt_off0001132b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1132B 16792 bytes
font_02_sfnt_off00012b42.bin
cca18947e4682b939fa44e9841573f4baf1757f0a1a16dbe240e699f594af8f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B42 10976 bytes