Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8cee92b5011681…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 13:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c15a276fd741bcafa6a4629db765c7d SHA-1: 68be7fc55d326d31739a658456fd7d421d6a3df7 SHA-256: 2f8cee92b5011681823aa74b9321922372dfba4aec3a268a1e0f04e1b173fc1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised WordPress upload directories and other disposable hosting, indicative of a link farm used for phishing or malware distribution. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8d75f3592---90249497427.pdf In PDF document text
    • http://amandamaitland.com/images/file/xesube.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/gizozesufifilizorox.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/pulit.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea4038e8c0---xazotim.pdfIn PDF document text
    • http://beateromer.com/bilder/file/58989046176.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/vazamuvak.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/27832286686.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/dekemageberinuki.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/kuwijop.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/a1f03f6eccaccc0d0e74259c6c4a4b39/28749024802.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095d1d1c17ac---74306819739.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/tutaxexititalug.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/56677295644.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b4032a027ad---84049958549.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/zexigalepovumijajabizizaz.pdfIn PDF document text
    • https://agermag.ro/mm/file/41600730947.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/29702440948.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab852e98a4---zubilisuxeretevesi.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/22813614156.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/nusomulopu.pdfIn PDF document text
    • http://uco-kampen.com/media/files/82173111841.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/68792040419.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/bujupu.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160986dc0b7f8e---watuzaponapiwakasugisuzum.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/dediwufufamoralolat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=conciliul+vatican+ii+pdfPDF 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_off0000d53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53E 19528 bytes
SHA-256: add06d9a83c647de5120f45c88dd4ec2eccecf9d058f6f75c8315a9fee418871
font_01_sfnt_off000106a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A4 10408 bytes
SHA-256: cb8c51e505d582ebcbd2ca71b7223f1690db2cc9503a44b107822cc25f6525d3
font_02_sfnt_off00011e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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