Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb580bc2faac3b1…

MALICIOUS

PDF

72.4 KB Created: 2021-09-17 08:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d8052d8aea7c936d4619cf3bc2689fb SHA-1: 7d87975dd0c17b181d9650d0c15728d7d164f015 SHA-256: 6bb580bc2faac3b1dea523773a9f7e89c36cdea8797fd89387992dcd5d1664b9
196 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns point towards a phishing or malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7dd45eb82---4448923232.pdf In PDF document text
    • http://ppfi-online.com/userfiles/file/49352653698.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/48035994420.pdfIn PDF document text
    • http://gabortech.com/admin/file/voravagorupom.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/92305972085.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/98228387379.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/26063639326.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/xigevu.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/muvenarotonarakoriziposo.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/022a0eb036e7da59d2948dabe3cb1b29/doseviwojipezi.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/33302276988.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/3e933d71f764fe4b7295dff0cced5c3b/6762055054.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/92419711068.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/mbqkltlvgs41elujgthci6k3q4/wefanokuxodef.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/merefuk.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/13343577197.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/biwigorefowaje.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/93343147861.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/nuwibajoxitozi.pdfIn PDF document text
    • http://upakuika.com/img/file/nurulogevosavejo.pdfIn PDF document text
    • https://eventaipei.com/upload/files/67660684528.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/detodebefenunakivotimuz.pdfIn PDF document text
    • http://irinabailey.com/upload/files/sigaximosiralozedapi.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/bumubewekado.pdfIn macro / runtime command snippet
    • https://vannordenvastgoed.nl/userfiles/file/18046817967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=gta+san+andreas+cleo+mod+download+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_off0000bb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB71 10656 bytes
SHA-256: 291b21a4cb4c5eb18ef6cdc56b746382952fcd8265ebee3f9297491dbdb485e3
font_01_sfnt_off0000d3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 15936 bytes
SHA-256: 2192c207f8e01608ebb4a52b26ae05b4844a3ab0bb33ae656edf7cd35fba7c2d
font_02_sfnt_off0000fbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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