Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f8827923da348d…

MALICIOUS

PDF

86.4 KB Created: 2021-09-13 00:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e8cf41cfa0fe27afdf801d4219604653 SHA-1: ffb6ccf55f69063aa11c774080865af399307ce9 SHA-256: 56f8827923da348d9e7c82ec80378dd165d61c61ed05cdbae6a9c4f11c327f5b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is used for malicious redirection, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.grupoaccs.net/ckfinder/userfiles/files/38464386786.pdf In PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/68443034973.pdfIn PDF document text
    • http://plise.org/userfiles/file/noropezudavugafobezezirob.pdfIn PDF document text
    • https://mmszke.hu/files/file/57952736582.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/setig.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/61188788893.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/53726377020.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/tomer.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/wotitotorikur.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133a61b2130d---dumikagidipuv.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a19249f8d199b1411ba1709e0b1f0200/sikukavejimigex.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/66999470883.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/neseno.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/nukepulosuturoz.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/weweruramukubunam.pdfIn PDF document text
    • https://blogsma.com/files/69025100829.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/dazuvebumuwij.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/57303537180.pdfIn PDF document text
    • http://snft.ro/media/file/luvenewonubo.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/8154685562.pdfIn PDF document text
    • http://come2menorca.com/images/file/dejorabaxevufedawuv.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/tuvisirutisega.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/507b8ccd40839dfdc23822e52bc7eb1d/76432323979.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/penepilugoribekewiniwef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=best+launchpad+app+for+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0B 18460 bytes
SHA-256: 3400344139d294568fba9b15f9f55b2737d06fae1f5aa97d03d3ffc641b2467e
font_01_sfnt_off00011ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD0 10872 bytes
SHA-256: cfabefb7b049bb64be40f21bf4fd8eba9333648291245df499d109ee1e4f2886
font_02_sfnt_off000133dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1