Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ecbf01e38075b2…

MALICIOUS

PDF

79.4 KB Created: 2021-09-03 18:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e943806dd15cbf307548ece47e326cf3 SHA-1: 3545be7afd1aa2653c543fb3aa7709183859341c SHA-256: 78ecbf01e38075b2daae32a5d89bbbb87960340c5a6a5f0ca32489a2cba49ec6
96 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document is designed to direct users to potentially harmful external content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2cc7222bb---72629553960.pdf In PDF document text
    • https://premium-house.uz/images/file/pelipilido.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/lajubamawevejetusinesep.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f26a52f0f4f---simanawujisimefewavu.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/69318793557.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f316d902f3---kivawiritipebigog.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/misebede.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/13916644908.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/8c0e2f59c58496a5d1615c3b9d1f99de/bumoripidixuxabagumire.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd3be0a6b6---69650187950.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16116c5f9060b9---15800190915.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/tobefokiko.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/49685229022.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/konokisajebufat.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/zixezoxuletoralidam.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/81000340985.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079de7555f96---73583278741.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/56895027809.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/3h8f5ha7l02d1u95davp40pqbe/duwuwepuxotupoma.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/vesolozirakolabo.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/veluzovevijini.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/6331973074.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/birikiremisazuxadavazof.pdfIn PDF document text
    • http://df-foundry.net/d/files/detelesifanagiges.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=congenital+gastrointestinal+disorders+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_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 16784 bytes
SHA-256: 47f912401922b61ac0894c2fc4787b95aefca504e92268853eed8b10b004c2cc
font_01_sfnt_off0000febb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D2 10704 bytes
SHA-256: 82afd8a0d8f68cd14e770b943ab54a6570b78f792934671c26b66bc6351727d3