Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb79d2df11bdc007…

MALICIOUS

PDF

73.5 KB Created: 2021-05-25 23:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 7b87a474c04a698986f921529cce1110 SHA-1: 892ee15b66b0454edf1be593b0c23bac59268c26 SHA-256: bb79d2df11bdc00797ee49f08f5289181bca193d1852c2e0fd7b103e621fe22c
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 0.9998

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://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/ca738a0e18d6a1fff0b730eada0a0857/78071097471.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/88a0a3132691d009ce9944d4f00c6ccb/nukunekejifokubewinura.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/fkprtp9s900rj2uguq2hkiqvkd/lovawufepunimevike.pdfIn PDF document text
    • https://chp-travel.ir/data/file/14001479309.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/66557268259.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/44407236023.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4ier4q0vph99rpr73ipbujus84/80431106444.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-19/20210519132304732964.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e13b1953dc---lezobanixigoteter.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a28b8bc53c772fe028b1d949d2db579f/3363684222.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b35cbc86b---77929305662.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efb8bb9833---kewilokivoxavubaregu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a093891a4ec---xulukubabavigate.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/2665467693.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/8ae5b5f64e1deaac27c5480c33b0a37b/xikirujubomowerub.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/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+one+click+root+for+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 5184 bytes
SHA-256: 07e18ef62d8b764971e89531d442288a19cf0497537f011a7db63b06012f95fe
font_01_sfnt_off0000f560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF560 10520 bytes
SHA-256: 5a50d72f4412d0b1b0e5f2da28a5e85563d3f749616f717d261e7c7620ecb8e6

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