Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3683ec5908c994…

MALICIOUS

PDF

69.2 KB Created: 2021-09-22 16:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6c3976d639dba47c0233bf78855745d SHA-1: 870158e3a69104479d83906eea39d83630b7327d SHA-256: 5e3683ec5908c9943461fd0af85ccaa7b621f37d577d418f516d6df9b881b2a4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to direct users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF-specific heuristics related to link farms and compromised uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ispartaorganizasyon.com/ckfinder/upload/files/lajirak.pdf In PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/mudumarofezon.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/41583245911.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/riralefakevemaxupulex.pdfIn PDF document text
    • https://kratky.eu/files/file/35701191153.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/1732053015.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/82487784142.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/wajobuwadowobop.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/66772992940.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/1000950239.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/40ubgk952ef90bius4ob5n01qu/88256792789.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ece0c41cb6---7055682721.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/wefepibebiwilewoma.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/32819828104.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/vazerafup.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/12271038858.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/muwalofarazixelofivirepig.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/0fa7e985fb0fe7821170b97ab79fab30/91049451173.pdfIn PDF document text
    • https://scalping.ir/data/files/file/nupinejofimamipigegokup.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/fusegufakobopevowit.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/2928873792.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/89426957079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=tea+emoji+androidPDF 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_off0000b473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB473 10192 bytes
SHA-256: 39e05f060bb19b3707cc2ce50f51c444ed47ed8752fc920264d91cfbc257bbf2
font_01_sfnt_off0000cb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 14628 bytes
SHA-256: c5b27efac7a8ac47daed18f05553067e314a1f4642e2174c7c5b6dd2a486d56c