Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ac392d02cf9d76…

MALICIOUS

PDF

108.7 KB Created: 2021-09-03 03:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c2badf77afa092bd9b02d69fc8405e46 SHA-1: d8a81480acde0185efae01366290fe1ba882a332 SHA-256: 19ac392d02cf9d76dfaaf0f2831e7d4ff1c9857ddc223c4deb7b62fe2e998dda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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.
  • 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://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e02d911a5---26742285595.pdf In PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/d9a712e2205a65dd451b81a8b4248abb/13530221816.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/71d6c963ff13ea97e1df4d24a898e348/kalomofuwupuki.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a6730f74f---52047722326.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/12794889517.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/telidivi.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/b1e79ad3d8423c7a23fd9c7012454407/fututuxulupogotegowabi.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/91578552058.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/dofobeb.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/lujovuseto.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/zosizusuvudigeti.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4f92f26a2---jetane.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/06473db13c8f00de795cb773f9563bac/79414798332.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/48569997757.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/90865165014.pdfIn PDF document text
    • https://ksboutlet.com/file/files/winunesud.pdfIn PDF document text
    • http://thaide.org/userfiles/file/gugidedozuxemefek.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/watubiludone.pdfIn PDF document text
    • http://lhs75.com/clients/46937/File/vudosiwaso.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/1ip6fb5h1seho9colbdisl40p0/19591582431.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630101200.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/40842779879.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/04f3f7383c12ee23130480eaa3b86649/70813087868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=zbrojn%C3%AD+pr%C5%AFkaz+testy+2017+pdfPDF 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_off00013aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA3 21632 bytes
SHA-256: 49bfdd29e5f032c6454c67c07e40836add9adf5f3df52fd8d80a11339b7595fe
font_01_sfnt_off00016fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FC5 11456 bytes
SHA-256: b4e7169dea2901ca56f5a4d31232e4e6b97baf2300170cb6ed7e97946a5f5d17
font_02_sfnt_off00018aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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