Malicious PDF — malware analysis report

Static analysis result for SHA-256 311f3d1d6eac64e1…

MALICIOUS

PDF

89.0 KB Created: 2021-08-07 17:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 410eb1dddded582823727307d1a9d383 SHA-1: e9bef954ecc7f9e90398b2e23ec5599b2b08f0a9 SHA-256: 311f3d1d6eac64e15dc87cfedbd92c59fec8337821a44db99e89b5ca3d06a704
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS uploads, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c657429176---merimofitokujilinugav.pdf In PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36e1d97ef4---pudoxizapemepuxipi.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/werirap.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/3a924ee44669f14afe41b6b2bac5763b/xazebal.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/79151614529.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/54164539770.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/30018900472.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/85598865139.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/61220816427.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608021cceb802---47276515031.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/2300607017.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607288f7054a3---97879608407.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16097753272b20---55393781966.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16103068cc625f---25141838939.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/f5a36522b0d3fd728e16d02bb995db43/denemimidositafu.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/zerovuvijotolezil.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/54019741015.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/14459692475.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/jajesevukigidafotamixijo.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f017c353f5---32814928580.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/1939048179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+the+difference+between+american+realism+and+romanticismPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/90480302315.pdfIn PDF document text
    • 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_off0000f95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11170 16732 bytes
SHA-256: 4187a80121d502ec19bcd9b9c97a9f0ba048b1c8cc0799beadfb02c6d0ebcdf5
font_02_sfnt_off00013cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFF 10960 bytes
SHA-256: a4ae1ac8b157f24b8dfd5d4556bd476a4b32ed8821dc5a7804414c12443d0411

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