Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd4d986a47ae8f7…

MALICIOUS

PDF

74.8 KB Created: 2021-09-08 07:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c643e3fc011caea2236beb96633e1b46 SHA-1: b27e58704a3f56d12990be579f40f631ae0f9349 SHA-256: 1cd4d986a47ae8f70e9b71146eb3b79139bb3172d3e35fd39b37b012d595402a
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://giverny-bkk.com/upload/files/jajunojuvo.pdf In PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/79075662041.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/sute2jq34g8plpde6gaqhg9p7k/52204343707.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/28932448545.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/nosomime.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/zogukexaseweponoradimaz.pdfIn PDF document text
    • http://fkhd.cz/data/img/refesujako.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/zonoj.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/24860590381.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/48030483427.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c4e13f377---38287566445.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/6qqvfvebkup2nplj8k8615a95p/42019473032.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096374849b8c---zaniga.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8b54d62e07502e9bb46780da04a309ea/tijese.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838028e416e---49036945450.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a292eaec2f2---26454623095.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/hr4a4spfl9hfn4ktrunavfnob4/kopuziw.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/11007723698.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/motemin.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/banaxizotower.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/davafepemufezikupu.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3a88925c1---65205503766.pdfIn PDF document text
    • http://ort168.com/upload//ckeditor/files/kuzabapagapiniwolavo.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/birufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=western+islamic+architecture+pdfPDF 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_off0000c28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 10860 bytes
SHA-256: 4cbdebdb5014ffab47b9b8d1ca686a9bb333b604b08a900650f9af0fff381855
font_02_sfnt_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 16496 bytes
SHA-256: ce0338d0b8f435ca440a6316afa45cd3a700d6ff1162f75f090d219bc19e754f