Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d201f9149611b59…

MALICIOUS

PDF

99.8 KB Created: 2021-09-07 20:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a706665c9f107117b35a6e670712c71 SHA-1: d7b37d9a906af2077ad6ad2527c3342a93493757 SHA-256: 8d201f9149611b59179b4d1ff1c043940a090f41a3b7e70b396451791e985e8e
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and external URIs pointing to compromised CMS uploads suggests an attempt to deliver a second-stage payload or redirect the user to a malicious site. The document's structure and linked URLs indicate a phishing or scam attempt, likely leveraging a download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/2j91h4i6fn0rb1fr6iehvt6j66/69393369623.pdf In PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607464c88c950---91766212976.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/12218662524.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbad049340---98071595221.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a775e61441---24127140896.pdfIn PDF document text
    • http://fluellensoflandreth.com/clients/b/bf/bfbe38bd58d8cb8bd08b82175287e3b3/File/38405172015.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/78c635ac56e3ea41cffc46308661174f/kevitutu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16120ffcd1229e---parudota.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-6/20210506204519293719.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/voxawajuf.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/zorozulukodemaporivano.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/744b1554c7320a1d3978bbd4b9c9d7b3/wogerepisolo.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/27385437755.pdfIn PDF document text
    • http://anninh247.info/upload/files/45276656634.pdfIn PDF document text
    • http://npas.ru/pic/file/migunamufugawukenelapoze.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ce2756aa1---59357692946.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ccef1846558---zumemipominemuxefonim.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/28612400176.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/dokebex.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/66697921512.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/kojirotipapawedabuzelu.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb15a44e9d---wububuri.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091a474ae948---68456765455.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/fqbjrs0cld634akd0lfrpe1ujc/21753832014.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/1d2abd922bea16c9ed78a6ccb53450df/gevizoliwifovafopamelux.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/12697706348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=serpent%27s+shadow+pdf+downloadPDF 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_off00011d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5C 19724 bytes
SHA-256: 31b8ed5d022113e16a95de639763fcdf0bbe3c24ac16fe4a73ea4f90adcc0480
font_01_sfnt_off0001507d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1507D 10696 bytes
SHA-256: 7799329aa69e7793a79d1ba6166cb7bf406a362c715570e90186f89be5c58f36
font_02_sfnt_off00016915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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