Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9035c8d0f44854a…

MALICIOUS

PDF

87.9 KB Created: 2021-08-06 23:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4f2435eed67909ffeb89f85b2b9e1a8 SHA-1: 2a17a9888f74e78886e1325e82513cfdf89b5704 SHA-256: e9035c8d0f44854a0fc0d7bd5c2f6bd75ba2c54ee5d8e874b0c015c37b33f1c3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, but the overall pattern is consistent with a phishing or redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://fidelishospice.com/ckfinder/userfiles/files/mameketuvamuzupof.pdf In PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/gagodixax.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/64425523731.pdfIn PDF document text
    • https://tekartltd.com/upload/files/wunoromenejika.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba66d7343e4---16692908261.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/nemutebobu.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b874315656---84542936249.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9242672e8---renowutezumelobefu.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/77040627494.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/nebaniwape.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/43490127221.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/ce24fde274b91fe27c8bdf81a3014d67/pofolodedixoj.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/m64ji3olv2ca19evfg6nd2ak45/2035929168.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffdc989942---wilelibipudirekiporewe.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/24028171836.pdfIn PDF document text
    • https://pindimana.in/uploads/file/6172670110.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3b3be318a67d5a5417bd533d57fc58fd/96168661839.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/70209675352.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16079de8958dbe---subaxajuwubodibelurufubo.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/gavazalasexonewamo.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16096323506421---kanigekizatusepusito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=bus+admittance+matrix+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 17536 bytes
SHA-256: af5c3b8a11d8bbbef3b8e7a820e322dc2d8c991f0d31498cee1e45e351044c4e
font_01_sfnt_off00010b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12316 16196 bytes
SHA-256: 462a4783e98b38620ac8f8ecdcd5a68537a1a8a2bd0fe099007260b825b6a7dd
font_03_sfnt_off0001389e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389E 10868 bytes
SHA-256: 4ea93f47dd7e03cd8232fabc1452f379561edc681b0dc3fe59305ccc7fe2eb28

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