Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ece40107fe627c…

MALICIOUS

PDF

74.6 KB Created: 2021-09-15 15:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 750523319584a18fc16c6cf56fe8586e SHA-1: 31412d9fa7ede238a8a815082cae4d6e61d7a61d SHA-256: 23ece40107fe627c6a0796a32a51fc4a62963db893d2e8b1d19854addc33e50a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://glassick.com/userfiles/file/5043714741.pdf In PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/memusojesonuzotulawi.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/11800739739.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/84788612263.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408cedc43ae---genukonig.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/87490576315.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161393a94ecf89---xesevuja.pdfIn PDF document text
    • https://proia.bg/userfiles/file/dojejerila.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/pemibabopezutarerox.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/jejikananulesamitiwe.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/78ca97909a08bc2dae5bf8e037364efb/80503041211.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/mosopaki.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/73001389429.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/31976828165.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16141912ad9719---zowomeja.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/76961062460.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/xizusawukev.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/fasulivi.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109140914061774.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd67d94f11---13020177630.pdfIn PDF document text
    • http://gardatrans.com/content/Files/xibofibeputumisosir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=what+to+eat+before+morning+workout+for+weight+gainPDF 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_off0000bfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E3 17032 bytes
SHA-256: e5a5f40ae995ed446fedd475427fb3a5428eb1d01124661ab43908f2d4851016
font_02_sfnt_off000103dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 10860 bytes
SHA-256: a59e82907d073cbea10cb6bdc416be6a1cc3bf91defd1f3d91ba10a0be6267af