Malicious PDF — malware analysis report

Static analysis result for SHA-256 5057e9cb7fb307e3…

MALICIOUS

PDF

84.3 KB Created: 2021-06-27 07:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8960caba7bcfd77e13a65a59929c1c6 SHA-1: 4ef03f5f2aa799b54c47969771cf101d2a213c31 SHA-256: 5057e9cb7fb307e31320dd7d5f08f29516f38c4b3e58d07edafdcd62f192ba02
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=reproductive+health+policy+pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbde43ca8d---49694084373.pdf
    • http://accessiblevehicleservices.com/userfiles/file/tafegaxagan.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/k3949q5vq13uaij734h85nl00g/vekimaxopefakixutuzafusa.pdf
    • https://nnt52.ru/userfiles/file/8832010201.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d978fe6927---86076269875.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0f3fa7233---vogegawodoz.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9017463419---34390285526.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/kv3rd22pprkusrggvev4mhpsd7/kiruturibudaveleloxugol.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e660e04d434410d4f162817e946f581c/83754443656.pdf
    • https://zzarosiscarampola.it/file/xotide.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/1911fff2b93f67eebe9ea84873cea376/16719334468.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/p5tkmar6ehkuah3160ieg7f6ib/mitosotel.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/2hoimr076qsss1l8i57io3s7e3/jebezoxesu.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080e92bd45ea---basajuvudixalidetozub.pdf
    • http://chi-kara.net/userfiles/file/16350166714.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/lazapidekesajoxuve.pdf
    • http://sage-chem.com/image/files/20210627_094322.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/f2df86584ee7ea01e295568a112f312a/xanuvosanuluvur.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c18a85d1c---merisurovekifame.pdf
    • http://lblussana.it/images/file/fimojefimowajojux.pdf
    • https://a2designbg.com/userfiles/file/81707686440.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ee7f5e36c---10362045042.pdf
    • https://coastalstudio.com/images/main/file/kuvejetet.pdf
    • https://stopserv.ru/files/file/ziniwitomituxi.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60c155c72b---lovomakupobigurexum.pdf
    • http://rockhousemethod.com/ckfinder/userfiles/files/6844981134.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B0 16792 bytes
font_01_sfnt_off000100c7.bin
be046e0a25889d518d9d4ef902d09ae88499003a029bb1ba20b65877aa098ae3
pdf-font-stream PDF embedded font (sfnt) at offset 0x100C7 10772 bytes
font_02_sfnt_off000119b5.bin
19f7564abb589d399aade0f511784e8cd9d82e1f3ec10858b2a964ff60eb1889
pdf-font-stream PDF embedded font (sfnt) at offset 0x119B5 16252 bytes