Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d72d8a32b871f4…

MALICIOUS

PDF

73.0 KB Created: 2021-06-23 00:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db8152a5177a324c2eeb3703722f8b29 SHA-1: 0a0296ac922bccdc26a8fd553abdeada0fe67308 SHA-256: b4d72d8a32b871f47db65abc057efc37b84b1238d053e4712278393374d7d392
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document prompts the user to install a browser extension or update, a common social engineering tactic. The presence of multiple links to compromised CMS upload storage and disposable hosting further supports a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and heuristics point to a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd323710b4---zuwodogun.pdf
    • https://amd-export.com/site/upload/file/33679567995.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9567dbf443171929248f72c5c297bb48/poretosafujov.pdf
    • http://alarcon-v.com/editor_upload_image/file/gotit.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/35f90098584a740ff2ed82bcac9f4f68/29292224365.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/d732feef31f9bc507ffb5a097f8b9829/ripelejanek.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/bf7099a44b6ea95872944b8a4080743d/27727129338.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/s8vmbdmj3lgs1i3qtck9hhp1ab/vereburededusofirodifuf.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098669a397ed---5201158250.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/d39c20033dbf15ed675aaaff775e8974/76059590200.pdf
    • http://inezorviskids.com/clients/37546/File/73432185490.pdf
    • http://scamps.biz/userfiles/file/7670095143.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/63ebd9beb336a1c135f993e1040c8d85/35351161616.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c02602f24---jadinajaw.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/c7ef7a8bc1c49b35b79024507e0fdfa4/namurifujunuwuvorasowuvu.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c3557508a---xuzotopogiwituxugipobe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=insta+downloader+hd
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd2a.bin
f703867876cb86dc40c34909010c5bd156446c640e1c4f45eca5ab001e6f7bf4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2A 4940 bytes
font_01_sfnt_off0000edfc.bin
fe5caceaff2783c5c9b8a16584dd73a0aede81b9ef8a8f8bad36b89589216ad7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFC 13352 bytes