Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72e1f2067d2e584…

MALICIOUS

PDF

83.0 KB Created: 2021-07-16 04:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6ff3124fce723a77640230d516d28bb0 SHA-1: d03898d298885780c9bffc1fdb058ecf7c284b34 SHA-256: d72e1f2067d2e58418b36a3128729832fcc25b8268fcbf7ee1de2183b5450e35
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, indicating a tactic to distribute content or manipulate search engine results. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs, many hosted on potentially compromised CMS uploads, supports this assessment. No scripts were extracted, and the document body was unreadable binary data, limiting further analysis of specific intent beyond link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/dd6d897e82637fe17d5b6b3671375f6e/84221213852.pdf In PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d5213a1d2---63290285322.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/88936233683.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160870f1326b3b---2404120336.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/35687837928.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/xofogarivafuwakoke.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aecd9485006---82689264077.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87ca0699d9---pifipu.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/8b4b0658aeab3083c86ffd3db4f4d917/700344459.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c1ee27230c9ef80e356df48a818b293a/67895943152.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/kurivogunidimi.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/40391447086.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/897d59c2fb5707cf6f58608c96ff5c89/mewowu.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/29ik00nfcsbltppmnh6enoiisr/52785711773.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/37959808789.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/pipitobesowogevewilisovad.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/xofimiwixawe.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8b35b753cbc304684b3cd8ad8f0aebd6/14968249732.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/4cfac13d27f02c308df4c7b20ce69d71/kefunilozowuzomumibisomub.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a37655e229---bowubazid.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/podokuvajarov.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/85005815377.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/80300313856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=insurance+stacked+or+unstackedPDF 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_off0000e2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 10368 bytes
SHA-256: 039bcc0e0e46b3e1bb620926f26e7b3c54b9296ca22ae1d338019972f5482ad4
font_02_sfnt_off000112a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A0 16880 bytes
SHA-256: 3a07f41bc9e2afa33e48dd483b69eff324feeabaf260ba39d1d3be0b36008960