Malicious PDF — malware analysis report

Static analysis result for SHA-256 996bc1cce695fc53…

MALICIOUS

PDF

70.6 KB Created: 2021-09-22 18:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8ea61535875d093c8dc349f39e411df SHA-1: 7e739a82741ccc76922e4b27ab3069daff5beca8 SHA-256: 996bc1cce695fc53a436f90d060df94bb89def2659f3b8715f2505e986326cba
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 https://girilawfirm.com/content_files/files/25759069652.pdf In PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/64412456010.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/915584943.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/wokejunufobegamevu.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/zebumazonewezapunowotijin.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rodbrord6n8r7v85bdohag36bc/gedivivowemijebube.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/lvkoh8iqfi60v7apqsd7alocf1/68913564284.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/lalunogewimegudekexifu.pdfIn PDF document text
    • http://yoron.net/up/files/mefabalimofibizosupuxizo.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/9440721617.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/13349286441.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/87065313125.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219221616272787.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/naxogelizedelarogem.pdfIn PDF document text
    • http://coolscape.info/images/files/bonoxevowigozizipu.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/xagojamagelazo.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/68764009485.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/2160760781.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b43e045a02---bivazifiselu.pdfIn PDF document text
    • https://kawanmto.net/contents/files/99068857455.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/54220835416.pdfIn PDF document text
    • http://archbot.pl/files/file/58046393337.pdfIn PDF document text
    • http://tcihk.com/userfiles/tusulipujojowegikivitazud.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/47239521681.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/55982852331.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/74880204560.pdfIn PDF document text
    • https://bevillelecomte.com/ckfinder/userfiles/files/24317603023.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210912060457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=g+maj+7+guitar+chordPDF 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_off0000b7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F1 10688 bytes
SHA-256: f0171dfb2d2b29a7c0f9948861d27373119a2ea2ed865b3ffbc3569f1336fef9
font_01_sfnt_off0000d048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD048 14504 bytes
SHA-256: 13723ffefbccf34f255c2f552e013551ccceb48f9ec97a3f50636d978b915187
font_02_sfnt_off0000f4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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