Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ebd35354e3392fe…

MALICIOUS

PDF

78.3 KB Created: 2021-09-03 02:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8a498fa1c2374a9eaebb287fa506356e SHA-1: 568e104d9d19dc1f1484c89fc8bc9f17118d8bea SHA-256: 5ebd35354e3392fedd1ec2f7d0537a487b63dc1a63f45fb9fd51c12b9d99dcc2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised CMS uploads or hosted on disposable infrastructure. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to lure users to potentially malicious sites. No scripts were extracted, but the overall pattern is consistent with a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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://yule-sign.com/upload/editor/file/20210622153232.pdf In PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1e69485fd---19097016494.pdfIn PDF document text
    • http://marymo.ru/uploads/files/79044465596.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/9e5feb47a1dd13fcb5b0455731fd574b/73758684614.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/71747350106.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/prhqde3nbu56qgm301uqnkfj73/puzigepa.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4bc29d4df---77685044456.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/6d42004e85cb7ba7a476f7cd03f11445/77294937156.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16129c152848a4---mefed.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/hv969u9bg9i7vrsn2nc148ju0i/31140399420.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/97712395966.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be13186e9ed---91025678233.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/65658538545.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021060318232281.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/womotuz.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/lararesesu.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/14a44220168493dd974c03c762b08113/sovidagipenizorelir.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/kasoperela.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/81433164778.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160741df62e4be---mosovofasuzojonukiv.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114f631713f6---91288313215.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765670d2289---xagewegukixujibesugube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=versant+sample+test+paper+pdfPDF 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_off0000d098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD098 16856 bytes
SHA-256: d2ee10c5c13e626775b06a93d8ad539dd3b31d595b7ea2ee47b6799ab9741588
font_01_sfnt_off0000fc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2F 10416 bytes
SHA-256: 42f82f038d7a9ebe35c3c42663139779f29166583ecda601bb6cefed4a0a171e
font_02_sfnt_off000113c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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