Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae2adba744c1a76…

MALICIOUS

PDF

72.0 KB Created: 2021-09-07 05:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cfe369d8923aba45436d6e8819aaf8b6 SHA-1: 16784c5161432a5c8982a4f6cd2e90fed2f0aaf2 SHA-256: dae2adba744c1a768df7102e457eb0858517f367f486c62a88c71efa21742324
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to other PDF documents, many hosted on compromised CMS uploads. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the overall pattern points to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kultmotor.hu/images/files/zunatamivusolekezipov.pdf In PDF document text
    • https://its-bulgaria.bg/files/file/fajase.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160d3331b21b8f---34025522836.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/8190499012.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/finur.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/m90tms0c1meeo7l9po3q85n887/90325855405.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/60049675467.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/52763276381.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/13051833173.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/ziwok.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/73093276928.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/0cf18f9d6010483fc66ec2414fe0dfb6/35641513646.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/41187919131.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/5afaafce445fae1f6dfad5bc2f363ff8/nubegudev.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/bidezipi.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf08481752---99973553221.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/2b7cdbd7e92aea147961ecd1fec658e3/jifenagoxofetuduzifa.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/s71aasui9n3ugfhf20l4gjlu24/20761975041.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/8835284818.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/53322084374.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/82728011863.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/xitajuka.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/soxogivuligomavimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=racing+extinction+video+worksheetPDF 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_off0000ba0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0F 10992 bytes
SHA-256: ce2b7177a2cd7774310b48576e9156ab5498e6aabf2ca3cd7e2b29fd0e019696
font_01_sfnt_off0000d379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD379 15316 bytes
SHA-256: cf420d0ecd1ef8897ebf3e2c9dacad6c36b4e0f16bcea921e518f5b5de2c637b
font_02_sfnt_off0000fa15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1