Malicious PDF — malware analysis report

Static analysis result for SHA-256 a597d26376c85d99…

MALICIOUS

PDF

87.3 KB Created: 2021-08-09 08:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 759b30504660359f042ac3794d0eaa31 SHA-1: bee7fafcc140affd0671987ef73bc8d419117dec SHA-256: a597d26376c85d99ae052d93f8797ebaa7506be764c59e85ab7d5209f704ba04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' firing suggest the primary goal is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mazdooradda.com/userfiles/file/murag.pdf In PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/29a548f3c5d2d94664029ab00a8fd868/kiwebedolivumosoxeroro.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2aad48ebaee400c8ff39605f931a109b/sekemefowezidoko.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/83797124470.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/69629998126.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/40cb0ace1ba6e077371480d7302e0e43/lupotavu.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/1r6n5d1hk333nfkhsrecrqp5j0/8874222256.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7e4237b1a---38350789165.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/a1f977221a4fa0fcb800b020655e1667/70931432025.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/zovolesigixalesatitegi.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/7745603055.pdfIn PDF document text
    • https://soechi.id/userfiles/file/jusatezujotej.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/8546785328.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/0547ed9adfa685ccc56477aba76e9f8e/2410433010.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/10571823011.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/ganafanezalikurak.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/57976954296.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1627457062.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/49df9b823f9a94ec98666afcc6b5878a/pigezibiwibose.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081b0f20032a---87985095998.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/likelem.pdfIn PDF document text
    • http://st03.it/userfiles/files/23828196883.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/luwineme.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6bcc9db62---32296662265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=elementos+del+proceso+comunicativo+a+partir+de+los+modelos+de+manuel+castellsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC70 18464 bytes
SHA-256: a11ebe5cf2e21395d4a2bc4ef8bc6ad2302e34654e53d4a24f756df156ba0a11
font_01_sfnt_off00011b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13334 10824 bytes
SHA-256: 50696b7dd39bb02a109029636e966f38913c2f8062161d74074203f117a914c8