Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb561f620c648ec…

MALICIOUS

PDF

105.2 KB Created: 2021-06-20 02:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: eeb6c2ea727e584358db072f16a4cc93 SHA-1: ecf3100d9bd2edeb1aaf68a592e0caa090cc9471 SHA-256: ecb561f620c648ecf79920879ef579c19385dc0c29fb59e397de4c5704353586
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160897529dae58---86118369102.pdf In PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607debe72dc62---20852263295.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609342134282c---filixebewuzusegopisaza.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/70936732173.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/80836187064.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021052416020873499.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608752e025a35---26930863679.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/8813fd681cbb9d8ae69fa50f104e85ce/ladezalife.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160b41e3aeba41---jegivofi.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e53fe3ac02---31024307129.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/posimomibanuxu.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608726947f0c8---rawapekikonakidemefon.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a39c462df49---jolenedaluwulojigiworunap.pdfIn PDF document text
    • https://marosme.ro/hirek/file/wurosuluza.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/78390458258.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/09adfdea7ae16efaf9fccca59c43e876/4487302765.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3289256258---tibeserukizodizi.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/30323778107.pdfIn PDF document text
    • http://starsunited.at/upload/files/83053123085.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=examples+of+formal+assessments+in+the+classroomPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E6A 5280 bytes
SHA-256: 200ff1dc046b8ce4cc95718b1bb5bc3a8658b91dc591a47410d04cab83c30e51
font_01_sfnt_off0001703a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1703A 11488 bytes
SHA-256: e7170d3a45c4bdfea6d7989be337c81a3abbbb2dfced473cb6c3df0fc58c2899