Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0893b1a621fc0d…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 05:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56c9e1ccb18e6047ba64b0e022f2ac9d SHA-1: c744ce86c308cb4765afbc349c8f0f20b18ec1b3 SHA-256: fb0893b1a621fc0df82e4a9edd4b1282843b3fa344adc6f4c48c1de7042910fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://huntic.ru/uplcv?utm_term=download+tower+craft+3d PDF link annotation
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/gejifagosonebiximusole.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/wevafiviwegilizazepilif.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/46171788328.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021091805481685015.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/45518204491.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/37693363547.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/614353e4b68fd.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/sokekatalumosowu.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/bowem.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/dapixinesekosolewakufuz.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/lerogimig.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/33987642620.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425fc39e321---xubonakoposexagej.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2d07b068e---xojepukexitisakozudu.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/vedopatani.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/52388477855.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/70542755236.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/81eddcdca4f50232d5bbff9a50ba75ae/47861418114.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/wufuwepodu.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/xojotojufubo.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/19190132473.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109161213278914.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/popalojano.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/80228375129.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_off0000de63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE63 10468 bytes
SHA-256: 944751b818f8e77c09ecf50f9ca3ea8e275f9e563584a8d2c7abd55688f0d4a9
font_01_sfnt_off0000f66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7E 17864 bytes
SHA-256: d58c4a82178020de7f2342b2f43d7d5ea18123f990c0e5af6708312e865508ee

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