Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad8214b8df43f56…

MALICIOUS

PDF

77.1 KB Created: 2021-09-04 07:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 539b9d25998a582f088d1802cb928a19 SHA-1: be71b43d8e44c2dda3a376a02005e251f4ac7e6b SHA-256: cad8214b8df43f5672cbe1be0939ed4e5910f9b747def2eb2ec07b64d02ed912
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress upload directories, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links to potentially compromised sites suggests it's part of a larger malicious infrastructure. No scripts were extracted, but the structure and heuristics point to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://wastran.ru/uplcv?utm_term=mental+math+addition+worksheets+grade+4 PDF link annotation
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16132cb80f405d---91604225293.pdfIn PDF document text
    • http://webbuilders.com/files/file/52295824045.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/23713584313.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/66801046721.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/52077342904.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6071154556.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/xeloparepakinivifuf.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202108/file/1630037270.pdfIn PDF document text
    • https://www.aeap.com.br/ckfinder/userfiles/files/fivipisegadesup.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/sakagegewepozos.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe748b8a90---69207910636.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d507a5719d---82056138499.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210714002724.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16078c2134f175---sexadowibasekame.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/37c317b30a4b42252c3e3a01c7470aa1/65169540679.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/12919723888.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/28805227902.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/rujexom.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/m6ohi2qvp1ea795hfee90mvcre/wexiwikexaxisi.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/54badee44b6c29fb3e72abf03295ec32/gefasopijutepa.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/59851141487.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/jusisajuwozeba.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/53520389449.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a09392e4b60---bebarilofukidinogife.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_off0000caa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA7 10944 bytes
SHA-256: 84c08b6aa3479f07e1d0ae0231f3926b8aa10824ffd875c91ec116130d8d71a3
font_01_sfnt_off0000e3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 16736 bytes
SHA-256: a68d6b9a5ad88dd44fc9096b34dada81a72e877b81808514eb875c74993b6e4f
font_02_sfnt_off00010e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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