Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf386e33587c5d15…

MALICIOUS

PDF

79.5 KB Created: 2021-09-04 21:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a9b78e38b5624c30a1617ed14e24076 SHA-1: 79f8a6ce316fce1fa979fb377bc73a4d77689cdd SHA-256: bf386e33587c5d153085dbc3a26717a98aa0af50d0ba293879ce62bcf33e3078
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to other PDF files hosted on compromised websites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the structure strongly implies a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/0ijbompkjvls8o14this48jie6/70222921186.pdf In PDF document text
    • http://bmcnx.com/userfiles/file/wijudevegebej.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb9c1d71df---37539348300.pdfIn PDF document text
    • http://trekkingsapatours.com/upload/files/97324889241.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/jonowulav.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/tivedajasezopesajifunuda.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/3733880997.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/tujesafi.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/medozumimataremitozatinux.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/62031445987.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079829ca502b---42706206647.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160741ba6b60f9---wewox.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/lopolijusozuliwawe.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/timiruzepelanopag.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/5cbad3c9cc39bf6c5fa74808a1472ddb/93474229572.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/iv2dd576e5m7suovolmdkfjm21/19386122698.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e7bedade220---77090040100.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b428e70a304---80989108274.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/3asojts9qim4t8n0vggmsjjl7d/57301664718.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/nogoxemimab.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/50f0667c7a3860cf2a91abb1e54687f9/40698055779.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/xevul.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/kufijupojogofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=convert+chm+to+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/2724d27200e0df1a45655da9ba59d873/46448495993.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_off0000d384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 10512 bytes
SHA-256: 36a87d40722cadbe4ff90e7285da9faf78740968f43876de0bc7604c442c5a83
font_02_sfnt_off00010358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10358 17664 bytes
SHA-256: 4f6241360e3059453b5a489489759d5801e307e41a859e362132310805f6ab91

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