Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e301f113c80e640…

MALICIOUS

PDF

74.4 KB Created: 2021-08-29 23:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 7bd7c6b04deb339153664d23c5729435 SHA-1: c28d665481306e5c7ee0d2e9db674ee9eb17d61d SHA-256: 7e301f113c80e640636eb111de7e229a36d2ddc085d8b3cb30e53ee1f147d4aa
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 0.9934

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://ketchas.ru/uplcv?utm_term=jquery+substring+last+character PDF link annotation
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9be683ae40---vuwisiw.pdfIn PDF document text
    • https://rajaunited.com/contents//files/mirovivurotuviz.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/59359088942.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/tedipexek.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/52748172379.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/supopugudinikavifazor.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/87733257504.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b8f2737c9c8beddf4e42e6f44769bd94/vijikupini.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/8a40cd97e334811f7338ec4ea8cd9d64/ponimidof.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/sawozitutibotuwez.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7f5cf2adb3203a1170716ef1986e7bf2/sarisumubaravijamevimu.pdfIn PDF document text
    • https://jagominum.com/contents//files/76944902524.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/vigefuzalabupexo.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acf0804944---javogusebazuwit.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/zuxozewed.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/39265876933.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/najodowoxorofedise.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c85abbc69---gepodanixibewujuja.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/28753934543.pdfIn PDF document text
    • http://puppiesulove.com/clients/7/7f/7fa6d7836ea929643a3c23f4562b158d/File/37761298519.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/wiladenotokijefi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b971c7e0fb1---peperejamufowomavuwaxer.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/34846937567.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/jivajepinunonusalalewene.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210726_160621.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_off0000c0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EA 16016 bytes
SHA-256: 2f3f55b6fd6b6bce9a214c3cafcac7aa4f81376642c89b439cdc07cc4b379e8b
font_01_sfnt_off0000ea3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 10880 bytes
SHA-256: 2668951ff8683148c710b7c20a339343b4f4c7e2b3d4ae2ae9e205402d568242
font_02_sfnt_off00010311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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