Malicious PDF — malware analysis report

Static analysis result for SHA-256 44bf47b836a30119…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 01:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e6afae27b4e3893b1629efd2a3bb368c SHA-1: fd0e217048908374630325648356c778da58fd4d SHA-256: 44bf47b836a301196c329b35ba78801434f3b30b038278fa6a004fbaf3b1c876
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. This suggests the document's primary purpose is to redirect users to potentially malicious or compromised external resources. The ML classifier strongly indicates maliciousness, and the presence of external links aligns with a phishing or redirection attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://angelcabrera.com/FCKfiles/file/suzepuluwozojiwovagutazal.pdf In PDF document text
    • http://studiomontironi.eu/userfiles/files/gesagavose.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/dd887497d1f5043650f2e7ffc3868180/2378608273.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/otfv6qbic4tqubbn260vl8umsu/rumevafivevanakodemibelad.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b2f5f16e00165e5937644c6653219cc2/momesajajegimeremoxib.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077ff2846b23---dejavaresozimeg.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/g46jk2sqqilegpg3g03ko87buk/sazuriwubowimisawejadi.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/lapopegawedid.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/44237235490.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/59149798791.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc267e414b---vowumitix.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070bc34f10cd---60262713786.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/nexizafe.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/jedena.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/mutaxolugivaxavirejofawil.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/fojetukili.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e26b68ca96---13561198726.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/radejujitugufinagizarux.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160817d717132e---kuzanumuwiguzivibag.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5bc838981---47997027443.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/31706969886.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fd3f6c8c0c248a98df3537d153e5174b/kubaxejusawiwevomilufege.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/30723965823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+maze+runner+%E0%B9%80%E0%B8%A5%E0%B9%88%E0%B8%A1+4+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFF 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 20592 bytes
SHA-256: 98501b4568ad502786716dca58cc3a23fa06643214b6c96ba6e42d9bf8b2f500
font_03_sfnt_off00011cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDC 10440 bytes
SHA-256: abcd09d0780286fa045091bd0c45a5ac1d69a5e0fd11bccd4df0df47de1652df

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