Malicious PDF — malware analysis report

Static analysis result for SHA-256 593ff5fc493e0861…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 05:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c4b402b8c1ca481f169df2a643768ae SHA-1: 73ca2b6517e4fd0990cfcf09468cc6be827fc5ea SHA-256: 593ff5fc493e0861dfbaf3ee0614d5af7f99bef16cfc0889b65745191c712253
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://floramarble.com/uploads/43202987189.pdf In PDF document text
    • http://shmgec.com/Uploadfiles/files/83299179387.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/66968739982.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/ratudaxevok.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6c6261a94---lagagixizoxubanarevuseva.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/76289567450.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/2654075056.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/razavasukexuwamuwipo.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cb238f1f025---56181754622.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081c837a9909---47390287342.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/2eta9hn7fqmgmppptniea1tbud/tazobusivolexalusojolefe.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/g99g35daeaujivkdghcdi0r9p5/zomodirik.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/36913926271.pdfIn PDF document text
    • https://hanomanberjaya.com/contents//files/73473123443.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/niladanek.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/jorife.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/dujexopunasefejide.pdfIn PDF document text
    • http://xsteelstock.com/d/files/81076058887.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4931c2227---20082393385.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/xixixatopemelu.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/cfa86d04a66c901497ded1d9e7638309/37376805903.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/73918440332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=medical+terminology+pdf+2019PDF 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_off0000dd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD17 11364 bytes
SHA-256: aee74546a04e6bf96b193bc57abc7aa3e0c9c44b11325af4ed9e50d0be2da8a2
font_01_sfnt_off0000f7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B0 17124 bytes
SHA-256: 46d5295f0e1737ad690b7991f8fe4c9d7728244caf50f7b3d09fd67cbac5b5ec
font_02_sfnt_off000123a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1