Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb6c35dd9a80c10…

MALICIOUS

PDF

83.6 KB Created: 2021-07-27 21:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5c9cd8ff103913a900dd3f1fe709490c SHA-1: ad931f35c443545a30440c9517cd63bcfdd243e3 SHA-256: 1bb6c35dd9a80c10bd7f63a9af051bad4c1fef31ba80d2d90dd975d3c3634b37
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to compromised CMS upload directories. This suggests the PDF is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://rehahomecare.com/upload/editor/files/7934514455.pdf In PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/500f54cc51ba2fc5fa45c012e6785dc0/tozupilopaforixetaf.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/djjiqr059c0h26fonjd37v09iq/24814014998.pdfIn PDF document text
    • https://blugarden.eu/file/xevajoguwi.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b43069938---kajulorap.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cecbf3ea5d---20282075801.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/xubuziwanenado.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/64999788328.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210629_623ab.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/negexowazilofik.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160af95510e564---fowowibakilajatukiwuza.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/88769956001.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/gazokoxijedikorilufoti.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08505ddd3---notuwesanomikedunap.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/67709457190.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/bc8e8cf5307ae6ea0f6d216431623d0d/jokodujij.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/pujotekadupivaredezuzat.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/27413481182.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/wevedobaza.pdfIn PDF document text
    • https://adium.ru/userfiles/file/74933168835.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210704192948009.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/92697444719.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/78915829935.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae26a14d26---duretisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ficha+de+anamnese+para+depila%C3%A7%C3%A3o+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_off0000dd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 18688 bytes
SHA-256: 39bf72f5584894db6dd55309c6b0ddef66e6f310d067ac6ee5937832bcd026d5
font_02_sfnt_off000123ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EE 11228 bytes
SHA-256: 3e2ba4a665f4ebc6c05f9e1a88f9e0055037259f1364bc1bd7aeb7696d322cdd

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