Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3601b54ddc3988b…

MALICIOUS

PDF

90.8 KB Created: 2021-07-08 20:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ce63a9219417e2d6b20b33b1aab59d2c SHA-1: 9f743aba86251cc9b720c19d5f2dd08efb8c8960 SHA-256: e3601b54ddc3988bbb8288e836355a4d3f7f4c1beef78610d2a1b3db5c6bdb08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/pivoq6k15ijf5pif11bupv9c05/91344711748.pdf In PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/92326843544.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/48426009244.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/bisesibokexunozabejazemem.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0632ab911---44103314825.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/fd7a0c8382c507d4fc22ad9b9a3dbdf3/lutesubobonizagifik.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c000b3da4d5---mitemosemixibajotowusini.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/t994vj25v01dkic2706855rcil/fukafekatipizezo.pdfIn PDF document text
    • https://makenie.com/upload/files/gominuzewis.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/02e4deb89bd9ef926b04f7812d7fbe60/28977085838.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/94e50f1240f5b65a13688584c44b4d50/mobigixugejulawulit.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944fba2c76e---96110072911.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/71111510553.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/e6c9c0f79c8d32e72338692d29495d01/jisozoxipirabovol.pdfIn PDF document text
    • http://christopherdallo.com/file/42604470242.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/gtgb298cjuml186bfn4l7avbdl/18905808255.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/nexijateririjekuwemom.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/a2db2a9422bd25b7c3e87332f0a78926/rewejuvapifividejo.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/61980091950.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/j9113upb2hlcv6lp4693tg0r1d/zadafu.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/koradugujoxumudev.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/22897199250.pdfIn PDF document text
    • https://777mto.com/contents//files/lovobuzitebesat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=simple+past+for+goPDF link annotation
    • 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_off0000ebe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 10672 bytes
SHA-256: 684b1054d82b33d4f5a10be07b612a6e8dafdd96532d5e2a0f541c5c076719b1
font_01_sfnt_off00010456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 16848 bytes
SHA-256: 6cc44a4e599ce7fdc516aee51be16260805771f582650bf46d0199bbbe19bdf4
font_02_sfnt_off0001301b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301B 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off00014597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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