Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d626cdb82fc4706…

MALICIOUS

PDF

133.8 KB Created: 2021-06-23 11:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 78290531579a3fe2be63ddd79561020d SHA-1: aa64570625b789fa94b79c5eef0476f0a42ce6f6 SHA-256: 6d626cdb82fc4706a5ec030e304fc2c667d23214f1bf099da77306d7c2c978c3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs, many hosted on potentially compromised CMS uploads, supports this. No scripts were extracted, but the overall structure indicates a lure for users to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b135038bc18---22792310318.pdf In PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16077cd2b55c47---dobafasivufutazofubim.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/18322689382.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/af827a792dd3502a372439e51844d76c/tizumami.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080b336e09eb---13497422291.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/48863618279.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d48e82296---30086297916.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ngk074v5lcl1cjbavjcga94dl5/43987630031.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086cb2b3a41e---mezevuluzu.pdfIn PDF document text
    • http://sy-smile.com/upload/files/60916910321.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/47541222026.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/40568310174.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c944fd2974c---zixijilimoba.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/1ac931532d643ca339b0cc2adde04781/mizezivisipopugililix.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cc74bc58197---xirelanegakopisazabufarof.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/rujivipoguk.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160930c490de7b---biviwezapunokizudapivusa.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/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=selfish+gene+pdf+downloadPDF 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 73580 bytes
SHA-256: da792fe168df9ee902a2a1d54ff5b1da049c281ede86c5dfd8562e82a44bd741
font_01_sfnt_off0001b98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B98F 5400 bytes
SHA-256: 5bbf37698936e0623c99800b2679b93f3c578c529fbdf4f5117fd10d14415490
font_02_sfnt_off0001cc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC05 11348 bytes
SHA-256: 8b2e2883eb00ef74b215690d5d74749130c4f3fb953316e52c223ba7fe37417f
font_03_sfnt_off0001f2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2AB 16068 bytes
SHA-256: 12bdfdd26b42687ed6d6e4673084773943fc64d80ea302008a05158b1f99f3df

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