Malicious PDF — malware analysis report

Static analysis result for SHA-256 777d235087cb4364…

MALICIOUS

PDF

79.9 KB Created: 2021-06-13 01:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 920fc455a9cd110113ac0bcf1e8fffa9 SHA-1: 62b6f9f33d5ff87ae918400b4518c7b37df3e66c SHA-256: 777d235087cb436472cd25672165f482d4667871bcfa0317e33d2e9ff2c89457
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs suggests an attempt to lead the user to malicious content or phishing pages. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://laborke.ru/uplcv?utm_term=regional+manager+interview+questions+and+answers+pdf PDF link annotation
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a205209f297f73d5b6a3613d84b4bf29/52472974811.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/c749cb0ae7bee46dc038a7fcffb01d46/fesewemutomiv.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609426b7539d8---jubodifukejokefapod.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1127153be---72587762744.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/felokukivixozu.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a720165f07f---kamoberamu.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/muzawofiwidu.pdfIn PDF document text
    • https://activepymes.com/pub/file/36706857354.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/vorefaxuvuli.pdfIn PDF document text
    • https://abeess.com/userfiles/file/89430245852.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021052422592373499.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/lakodizefuwajezusig.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/13701791007.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/dewuwaso.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803351a5ab7---fikutomifomuwaraja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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_off0000fac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 5648 bytes
SHA-256: 8eff5715eb5b90b494cbe5969defd9514323d363b412e1a6b7cbdabd701af392
font_01_sfnt_off00010df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF4 10644 bytes
SHA-256: 400d04e214fe0204c576ae6818a6c1ffc7ad264053c22b3b15011c1618298a20

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