Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9951cbda2679368…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 10:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a3ac772a89f4419ff5f3d3d79d2b6fba SHA-1: d9ab0623b0f7933470af1500f3dfc01770b1e9fe SHA-256: c9951cbda2679368e9bb41955bf09b8242e5ddd4d89e0f323b46df1ca7e1e738
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 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://yjsyrj.com/userfiles/file/7706309473.pdf In PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/63fba92a9740d154612fc4446a99cdee/27371752796.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609916e19fac6---sozopedupikojimim.pdfIn PDF document text
    • http://christopherdallo.com/file/24701753638.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070b162716d8---mavol.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/nazavaj.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f667eaecb8bcc6d14a446eed90bb7146/zasegerenuwimosudobej.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/kerukimirali.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5c0be7428---nodigasomexofotirolex.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/32135449568.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/rozibetolarejusurog.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/28536905504.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160777b0c981aa---zuwididumesise.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/duxapa.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/52072538003.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/47283048295.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210613_B1E6F03CA2FCFCE6.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/siriwun.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/dulebapalilofupurozim.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4443c7955---45890815883.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/40783548173.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c288405ac32---pinegix.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/vuzujanumolapozupum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+the+word+product+mean+in+mathPDF link annotation
    • 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_off0000e37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37E 10912 bytes
SHA-256: 892f09f8a5dd0a5587a926e224ff224f0513d1847c5e894582fc051a34b9422a
font_01_sfnt_off0000fcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAB 17576 bytes
SHA-256: 1cf73fa6a0f43808d492d09674324883a4676830945c86f2ef089779dbdca58c
font_02_sfnt_off000129d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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