Malicious PDF — malware analysis report

Static analysis result for SHA-256 042290e42e0432ef…

MALICIOUS

PDF

99.3 KB Created: 2021-09-03 01:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9e51f2df440d6851137365339f7f31b SHA-1: b8bf6fe263c28ea8377fc5388af8233fb8b7fa22 SHA-256: 042290e42e0432ef6c952bc15223b58df23b7fd751abf677bb2292af175d1ffa
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=infecciones+del+sistema+nervioso+central+en+ni%C3%B1os+pdf PDF link annotation
    • http://alexanderkanevskyartgallery.com/clientMedia/file/kizalolawufefedo.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b4e34e164741be923bfa6672435274cb/46600733418.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c1f17452d---nakavakujononu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bef3eb9bc---30563716828.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/d6n5t0h8kr3kt4nmu1f3014l3h/zuwibutiduduzefo.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/p2cl0ch9p5k78b395rtqqsv0u4/janota.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/f333abb4934e63a251425d4edab14a51/dubage.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160811b8ba7dbb---61329001285.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bd9784811---nuzak.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/72702670660.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/7482530916.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087219c63679---88316356766.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/68033156e28d3fa91bef40879c18890a/fiwowikabevapuve.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160940cd588b0d---46783910617.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/51973925272.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba87d0d5f82---wosusuwufumimej.pdfIn PDF document text
    • https://arerp.kr/data/file///topilagateluguwilebit.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/17354589453.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/xixusutomizun.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/febuvumomof.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/44203907931.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/21617111901.pdfIn 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://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_off00011ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000132d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D0 11004 bytes
SHA-256: b4c651b576acf5303088af7805e2b0a273a607baa0bb0ea9cb0d7bbd4a8b62bc
font_02_sfnt_off00014c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C23 19176 bytes
SHA-256: 30a30d8a36ec71c22cf8e4e1c8c784af570739befed79bd1d14e4b12de3270ff

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