Malicious PDF — malware analysis report

Static analysis result for SHA-256 84823f517ecbfffe…

MALICIOUS

PDF

87.4 KB Created: 2021-07-08 01:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 911f7ea6095a51f7b19b5d44319aca1b SHA-1: cbb8976f5b97003ef97c90c86b3eb2b58d7a15d2 SHA-256: 84823f517ecbfffed6adb01047806e0b68ffdf9d693a364d45cea638c5ae632e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the nature of the links and the heuristic firings suggest an attempt to direct users to potentially harmful content, possibly as part of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/41bcddf9199df916e5c23355879e91bd/50347881710.pdf In PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/fujisekuxoge.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/kapaborezonegapitile.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f2bbdf33a---nawutininexuvidowijodavig.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf401b0ba---44990031130.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ff9c1d5cd---56421019294.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-5/20210505142002677753.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160900eac016bd---paromojoredozuserid.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ilgcr8o3q8iajrlqqi6h031m48/nididomodavipitogega.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f0c59d15---zemifaxijatinalidabadi.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/36924003112.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/a93a65961b29d043ed2c45991d004cd4/xurimexo.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607421f486eaf---84659388576.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eceb4d87b0---bafiw.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608a097f642a6---33335130178.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/3346091575.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/11013121225.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/dubop.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/vajuzewiximajikar.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/17d1408ae6bf88a2d222a82d5d542b76/70092919532.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160988b23dfd35---91676489119.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/21743861560.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/wulowiwusovitotobuzakuru.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6c2ce629ff0dce1c43ffb0e48c832b1/10927366201.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/43178667243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=a+flat+major+scale+piano+finger+positionPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f3990759f68631aa2f53aa924f848bcd/51539788.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_off0000efa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 10936 bytes
SHA-256: 2f256b55cb7299af0f44a60291cb57d559589466b597a900cbc5452ea7b40345
font_01_sfnt_off000108f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001210b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210B 17820 bytes
SHA-256: 4b7a9e4dccfa781b4e8c94d08808a86f29cf9e49fe6be1db6da0cdc643201e82

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