Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b70c3e48ddd34d9…

MALICIOUS

PDF

90.0 KB Created: 2021-06-28 05:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30b6187e7ee0152ccd6439e22c1e94fa SHA-1: cd8489787df4614631fa07f3671d576c6669b1b0 SHA-256: 1b70c3e48ddd34d9d6f8da1769b46f5932f8015f5ae442071b68983b246e3e15
164 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 are identified as a link farm pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript suggests an attempt to execute malicious code, possibly to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://cephedanismani.com/images/pages/file/34296321445.pdf
    • https://topupdana.com/contents//files/31942106827.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc28b3590b---pezegutij.pdf
    • https://binarbaid.com/public_html/userfiles/file/74891040080.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51648b6b17---lurivuwobujekuzojeral.pdf
    • http://laros.cz/UserFiles/file/82934450673.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/sabidiwenulo.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/zedibuginabuxatixakizatin.pdf
    • http://apogeeconsultancy.com/upload/files/5825007827.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/abnnsbs6e5e456ejoa59ouf8nk/mowawagomuruva.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/719396196f3b8ba0a35d9fd3d98b9c55/dirapovijipanupaluxowizo.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/lq8hc1mdmsfchn3i8h7c1k3o37/zawoxu.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079c468363f0---kapelumedidenojobodifobo.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/gu2g52rf2icbdq6i4kq4oiqhg4/judivaretudirinumaj.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/h2ggt11q63a4ev4jgpprbttvo7/15790283668.pdf
    • http://alakharia.com/public_html/userfiles/file/43016667268.pdf
    • http://chongthamnguoc.vn/img/files/52373503281.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160760b65ac32c---sexurot.pdf
    • http://best-infosystems.com/userfiles/file/15588281493.pdf
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/np8e2ueetgial3kado37iujndn/25413804719.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/nlo5ngaaipq8dsh4qpb50h4ahq/67487957040.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=fire+extinguishing+agent
    • 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_off0000fbaf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAF 16792 bytes
font_01_sfnt_off000113c1.bin
b011477b82283aa645ae975a0ab86fd6b5e3975989c989ed1d9918e7f08718fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x113C1 17652 bytes
font_02_sfnt_off0001421e.bin
b0fa0e055a608e78d3103b73fd9ff9c9808324a1f9f531ef17aadf7d13c9ab9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1421E 10400 bytes