Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b65e13e64b69e19…

MALICIOUS

PDF

81.9 KB Created: 2021-08-19 09:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: efc4f1219dba120cdd48107260f9908f SHA-1: c4a7cb6152ed74de5e109ab64d0acac49b069c87 SHA-256: 7b65e13e64b69e19448a65da3c5d3c8ff3f7c98056ff75f242b495ee22b5ebd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://philabc.ru/uplcv?utm_term=how+to+pair+xr15+remote+to+box PDF link annotation
    • http://mofrantech.com/userfiles/file/94165221624.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/47511624497.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/62825915249.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/lekavuxujubetuvaleji.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/73772676040.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/21391020b1e68aa03395ecda1d8e1542/jizovuvexodosopefadirep.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/793da565d641074f47a32403e4d9440b/38516589461.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d0078f358---rebizigotipuwefupuvabo.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/807519519.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/38950442314.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/52910923083.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/tekizas.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d212ded1d9b---pesuxe.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/nojasagufejepidezetimazor.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96cff48c45---7505319104.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/mowegemudajimasotutuke.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bec1e6bd88---runavamu.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d2e1cf896---39053760505.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/litigulutuvesefevurig.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/solifowepepokeporekap.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/45059496552.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/vugimupekurazedudumekatev.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f568a76f0---65406571401.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/lb85lp2kafaohp6tl4urh5332l/giwoluv.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/69395819447.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c69fe03e32f---josimuguvekibur.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_off0000dd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF558 10600 bytes
SHA-256: d73806e59739d662fe4d46f23b5fc23957e7b45d44c84b3fb777a9511aaa4925
font_02_sfnt_off00010d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7F 16712 bytes
SHA-256: 27470606ba011a80a2cd1d936afc3a4d197cb3969d4c92ba2257a7623213b25b

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