Malicious PDF — malware analysis report

Static analysis result for SHA-256 e694a8e152a32f86…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 23:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c4bf5b3f132eb2e06fd7b6e025c15362 SHA-1: 1f4bb25b36b9cc2205c786f4081fc33ea1276d1a SHA-256: e694a8e152a32f86d8eef1a39060eefb57fb041723f5abe83dba89bbb307d0ae
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to manipulate search engine results or redirect users to malicious content. The ML classifier strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://inwebjor.ru/uplcv?utm_term=android+disable+touch+sound+programmatically PDF link annotation
    • https://tradingphrases.net/userfiles/files/58790029214.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/76591563983.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/wizumosovu.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/wumemibodudifinetu.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/serikilekefimalexu.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/d817d77f340b7838a5d3e9586f38b9c3/vuwufuxusititoxenu.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/kumomoduvidawobatevut.pdfIn PDF document text
    • http://stonebreaker.at/25260782700.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161303e203a85d---jemofogazixorafijuf.pdfIn PDF document text
    • https://robodom.si/files_vsebine/45283044426.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/62946534445.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/redenefukonapif.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210906_000330_6204.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/19950235256.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/58431678463.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/badoxuleb.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/42829450493.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/92639595144.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/78524069701.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/wugufosudomake.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/dowixifiz.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f78ac46537---nesowuzujigadavoleni.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/sufajux.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1614f4c7d8b607---70069108455.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_off0000af54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76B 11296 bytes
SHA-256: 3c83a0baff97b427ea5de86bd778515b979d6cbc0a1fc47b70d9e464bb4da710
font_02_sfnt_off0000e160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE160 16028 bytes
SHA-256: bff40a47d1f233c8bce1a08a42bca8aee2014a58be1763dbc1b7ef8d65171032

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