Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b9a33893e9a3c1…

MALICIOUS

PDF

83.5 KB Created: 2021-09-13 11:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1b2b969a9e88427f46873edf12e5a5de SHA-1: 697e9bbf4081b80c06f17111c3d1c6ab51784a6d SHA-256: 64b9a33893e9a3c148ea6c74acaf7ff3cd6e1a8f815ab4f6f9f5dddd2d0af47b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=trasferire+file+da+android+a+pc+windows PDF link annotation
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/daputizidej.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/wutipulolixetuzilupakijo.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/sogopeku.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/26957399260.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/6618398912.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed54060ecf---pitujatenefezikosifadi.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf9b122291---lividojimazu.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/08/file/kukone.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/rasuxakerabejapewerole.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/3186955379.pdfIn PDF document text
    • https://binhvi.com/upload/files/xabagumoriwivig.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/41dfb7833a6387d37c55ab232d446815/98150161588.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bcd793207---19774824135.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/polezopujevedog.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/fafibafebezufogovatofi.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/98479248237.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/10820829987.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/553816617.pdfIn PDF document text
    • https://ebooksweb.net/files/file/kewafodimasigutijolumate.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/lijelikasoluzonakemidom.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ed33b8edf3bb7bc06a2e24f91cf7a3d5/gimiz.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/dogerupedujebume.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/sififijabomoporejolapoz.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/mokawew.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/mitibagomusubabulujologo.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_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 10564 bytes
SHA-256: fee256b0291d8755409dd954d3d96b61f9e0feb216c54545a541a55ae4752b41
font_01_sfnt_off0000fa5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 17980 bytes
SHA-256: 64cab3ea4d3b20e1578b6ad3a2df7fc2bc94befc5dab266e2349c7885ecbbdea
font_02_sfnt_off000127e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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