Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4b32f39185be39…

MALICIOUS

PDF

76.5 KB Created: 2021-10-09 08:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8b1155858f29aabfa0c9f2d4997345e1 SHA-1: 4548979133e8b9e8b0857fe503c6efe988c2ae1b SHA-256: 7f4b32f39185be390a4de92fbb2218eceaed4eea1fb987144f17d16ba401be67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/6339664122.pdf In PDF document text
    • http://cartopack.be/Images/file/84193214415.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/12371303238.pdfIn PDF document text
    • http://xueyuan.zlyxgw.com/uploads/ckeditor/files/20210917045235.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614045e3f15d3---xozugaxafeporatifiz.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/30d2ba54d731f0e42737e5e1681d8f4c/93284455322.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/7d258861abddcc8f9b666f11a213a400/5192368270.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/16627410419.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/dududuwalulejez.pdfIn PDF document text
    • https://proxus.nl/file/11997757694.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d390102e9f---7582237550.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/suxavidonuv.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/25104319127.pdfIn PDF document text
    • http://candientuvibra.com/images/file/mojoxorelulotiduromipu.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/74341099435.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/69228458830.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/navawosezav.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/telapirividiredomi.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/41508279645.pdfIn PDF document text
    • https://sy-chemical.com/UserFiles/file/mosewokiladituxulupa.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/89534968102.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/ganofifasugoriximigu.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/or7p8veh4c8jvu8n3mt85l0ph1/33133026140.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/sorafogigaxi.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/ninomugutuzoriji.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210923_111517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=army+of+darkness+full+movie+freePDF 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_off0000c611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC611 17640 bytes
SHA-256: 01751437b1a541dbb2318c371d9cefc99c960ff3605c6cacb233d7a40f8c2d37
font_01_sfnt_off0000f392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA9 10772 bytes
SHA-256: 715e35ff5db97d30af215840bf6f3e96618942e5886c1744995abfed1a3ab91e