Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f25f243b4c00873…

MALICIOUS

PDF

75.7 KB Created: 2021-09-03 00:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 273e13910f6da65e3400b2aae0188458 SHA-1: 8ab38e7f3b4e13ed464285bbcde9a689d22f4b1e SHA-256: 6f25f243b4c00873ade79859509580a3e81dc4c5314ad88c9aa4ec6586ab1ccd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised websites, likely to distribute further malware or phishing content. The ML_NYX_PDF_MALICIOUS heuristic and ClamAV's Pdf.Phishing.Trojan detection strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c61744f334e---gukuzaweb.pdf In PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210805_ADED31EBD9100741.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610345d318459---witumilaxarow.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/afd2f7498294829e6e8c20151e47be07/tufaviduf.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c628f3f1da8a8908d7b3ee8cb6654c1b/gukov.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/75754667864.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/kst976m65obotrs56paf5agv9k/90056410996.pdfIn PDF document text
    • https://ubranni.com/uploader/files/89730474433.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/48f1c949556f910502fc94ecad26adf7/memolawinotimi.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/zilimujoke.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610401cf29f5e---xobubod.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/51445440997.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210527213621268.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/66041014932.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/86420331009.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/8895d7a664f04bd26301ab1005d432e6/nanewetixo.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/58683878233.pdfIn PDF document text
    • https://stvorki.ru/files/file/wimugeg.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/29888386343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=bcom+books+pdf+shivaji+universityPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/3c8ac68307a15759b71d82d4e11fb30e/7922681924.pdfIn PDF document text
    • 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_off0000c13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13C 17432 bytes
SHA-256: c5d3622a26838d94f7e15c2959b67bfe4841b782e6cf960eaa975c63cec4f99d
font_01_sfnt_off0000ee89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 11532 bytes
SHA-256: cc3b3705b16ec7716a4d2f056cc90d21eb69d9f49d247f2ee51997dddf5789e5
font_02_sfnt_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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