Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7b6742ec1053f9…

MALICIOUS

PDF

84.6 KB Created: 2021-07-09 06:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4797bc6bce19c4f87a16355a782790b8 SHA-1: 6a00fe5f6416a1b7d9c81b927579524b065fea0f SHA-256: 8e7b6742ec1053f96d70d5003facf29ddea8e412e8a3e154ab669fcb9d3d7d5c
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicates maliciousness, supported by heuristics flagging link farms on compromised CMS uploads and a password-protected archive lure. The document's structure suggests it's designed to trick users into downloading a secondary payload, likely a PDF, by providing password instructions. While no scripts were directly extracted, the PDF's nature and embedded URLs point towards a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/bp5dn3jvm3jdfn31m9f9uh4ss4/13268316232.pdf In PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58660130443.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/zofujakesoguwunakapeb.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/9b8ee8252b20ebc066bad9095b87c9e3/bidoka.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/69351c72ff2e70eafdc2508d3114412f/jikikefulapisofi.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-07-01/images/files/kozubizafusivudok.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a23366ded73---barisamavezizodufatesemuz.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92c8c38c30---66458529288.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cbebb445c---11683815573.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a183d481f4c---nenes.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/hmq3dfismdl9dtt0tm6c0tckh4/vokitepatagutomupojesoke.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/4097391750.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/xejuninoruwexikuwusefomin.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/7f64c04e408ed141dc6bf30d167475bb/34137180850.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1f4cb49af232bed2ab86bf52f2db3c5/devanimikavojavuzodu.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ab0o6hefms2f5p0iun9n8l7hm4/wunekeni.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/95dqigs8u05efl0cmthksugnil/64066476044.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0c709b5f85388523d5bb1a965689e666/6874434598.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/21be4466393fd21493686f59aeb151e3/88620464044.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade45680329---78102148887.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607c638f3298d---79116757514.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/77563416755.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/70628287453.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/bukufuvewabisijap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=unicorn+color+by+number+printablePDF 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_off0000e8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BB 16868 bytes
SHA-256: d796680c9bf465e57bf758f031c4e92c3966bca908ccadc7a15494d4924e7983
font_01_sfnt_off0001146e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146E 10728 bytes
SHA-256: 3c87b1f6e118591a2c0fec9d575c3799ca7c832467531fa6c3f0138a9ad50682
font_02_sfnt_off00012cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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