Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b46c139d9e45e5…

MALICIOUS

PDF

76.7 KB Created: 2021-09-07 18:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5c86ed4fc10353f72481ca20832edfb6 SHA-1: 3255f1b900d1e8d293855b9418512e7b0a99bd28 SHA-256: 28b46c139d9e45e50ea3afef146aa5b694ce265fd0be57db3a7d10adfcdb02f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=basic+clinical+pharmacokinetics+pdf PDF link annotation
    • http://ahkjt.com/upfile/file/kogatonewenom.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/78863868720.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b0f81426c---44330529392.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name//files/nikirewipalujewonemumuze.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/17198474863.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae022372a1f---serewidizufijezojofot.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/boperave.pdfIn PDF document text
    • https://clinicscrm.com/img/files/viwosagekabelipu.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/0g4c6535s3kuigk9ldnuurba7v/defutera.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/tunc03qfj8kavg383n0eksukha/99165324755.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/41277001517.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/pkj9akllrie8dg0tbc9qvb1bn1/jizarad.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607252aeba77b---78618388488.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609090b9bf538---40002895252.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110c16a7d01f---puvenaxes.pdfIn PDF document text
    • https://majubesar.info/contents//files/23509803464.pdfIn PDF document text
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/6961069270.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/60553544711.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72640460317.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/87612562661.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/78620502653.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/19094749483.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/44532014787.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/dujenedevazisudol.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/sosegolulopifavoguziba.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_off0000c72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72A 11028 bytes
SHA-256: 03a63384e4720bcb95279b64be43fc73d24399d9daa860d81a27f64a809e0289
font_01_sfnt_off0000e09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09C 17192 bytes
SHA-256: 333c4cfe63a101fe3b099ad55084a9928e1393088901c4e386aa66da3adf0758
font_02_sfnt_off00010c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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