Malicious PDF — malware analysis report

Static analysis result for SHA-256 c96e8560b1c53bbe…

MALICIOUS

PDF

70.4 KB Created: 2021-10-03 04:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 88c16fb4e50e5feaeb58a8bc8e20c414 SHA-1: 5e9aacb7758a7d382e74cc5aff1c6fc01c3d5997 SHA-256: c96e8560b1c53bbeffc7ec1e0f524990a49c20ad1274320e2fe18cb657d6c659
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests these links may lead to malicious content hosted on compromised sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=how+to+find+30+60+90+triangle+sides PDF link annotation
    • https://semagro-msw.ru/pics/images/file/zewobelunotosikejidena.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/zexuwobifivomuj.pdfIn PDF document text
    • http://www.centralperdana.com/file/bapomobojamasige.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/ranomupixudorulalafinip.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/12475561466.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/tununa.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/fuzowe.pdfIn PDF document text
    • https://fong-cai.com/upload/files/77939537195.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16153e3e4bd1b5---badenexosesikebatero.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/93625799137.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/dopowak.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/pajevizid.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/62513954566.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b86fd9f7b---dogidafidemutuwemizuzu.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/42648831755.pdfIn PDF document text
    • http://rayer.cn/d/files/rovexukipejefunu.pdfIn PDF document text
    • https://arerp.kr/data/file///kinuwufojujubisek.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109100806123811.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613604c718fc1---xivugufezaku.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/3123420744.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f41196ab2e---jipapebome.pdfIn PDF document text
    • https://akemi.ro/hirek/file/siwuwomuz.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/56652999392.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f293215263---41460656184.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/kifiza.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_off0000b17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17D 15988 bytes
SHA-256: 3ce8a5f51c2bcc4ec382fd2f3022f102893733f38aa8c743bea28f4d16247188
font_01_sfnt_off0000d9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 11236 bytes
SHA-256: bd2cb5e25b50b2ecbd3937d6f2a4b62864433be5614db098d721493683fb713d

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