Malicious PDF — malware analysis report

Static analysis result for SHA-256 531cc8e377cb5b4e…

MALICIOUS

PDF

68.0 KB Created: 2021-09-06 05:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 52196ba7d9eac1dde9145d46fcedfc91 SHA-1: 2056d4f128e44c909fa7d03079b520313d964646 SHA-256: 531cc8e377cb5b4e2b80c9b697fc39d624811ea3d938d658b381a891f14adc62
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The presence of link farms on disposable hosting and compromised CMS upload directories further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://wcfkenzi.com/ckfinder/userfiles/files/rarurekigi.pdf In PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/aeb9f948dac3d427cd4da4cb0ea96075/86055392086.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/9640654969.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/fuebn0knvfcmf61gj36fd4qfe7/3581146377.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/84497827758.pdfIn PDF document text
    • http://built.lu/userfiles/files/71787242350.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/f97c1807708f975548600a121ac06c91/77275161515.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/repanujelar.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ac61ec7c21a---pakilejedaxe.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd250ac93d---fuxevotuvijatekobu.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/mozap.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a78de55e58ef69717be43aa6e0c441b3/mivagizadit.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/segefirufazidalilojob.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/m0v1hctrk0tunpf1s5h05k7cea/99197559621.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608219dad1ebd---jizofozimuvokesiwuzexafif.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607331394ff1a---50182084795.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8add683e4---gunolokeruba.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa50641b8a1---20726263219.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/91582039138.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed875e0e33---69436802605.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/gamunejegipimiraxelirota.pdfIn PDF document text
    • https://csodamalom.hu/files/files/xewap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=irregular+plurals+in+english+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_off0000aefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFD 14520 bytes
SHA-256: 590296d41d719f8489edf856cab3a36f7562e1f5600aac3520c862900dc174bf
font_01_sfnt_off0000d30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 10612 bytes
SHA-256: a1454effb7d2a66246afa5d0e0115a96653475a1d3e7e368f69d91c34f876704

Open this report in the interactive analyzer, or submit your own file for analysis.