Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88b221b0c5c4986…

MALICIOUS

PDF

85.0 KB Created: 2021-07-14 02:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3751fd68ab06463e75b476c23a2b3f3 SHA-1: a675318a8f29b21551c72519ad77dfe4c3c69c9c SHA-256: b88b221b0c5c49861a1d1fa9362788fe0bd10b7892d275dfff5ea275b0c6997b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a likely phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious. Although no scripts were directly extracted, the structure and embedded URLs suggest an attempt to lure users to external sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://betalinktech.com/blmedia/file/faruja.pdf
    • https://projetounificado.com/uploads/files/jupanoluvujogaxegiz.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/9918c216d5c2d8cd17e80bc8882076e1/bofoneso.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8629cb03cc---gizobevubobolebedela.pdf
    • http://punaide.com/userfiles/files/gatasalivuzo.pdf
    • http://architects-desk.com/uploadsfile/86213539024.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bad822e649d---85494635333.pdf
    • https://zzwgjx.com/d/files/jedodefurumakinak.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/71b98031b31997756ce969361bc24edb/vapofawibiwun.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160913793d759f---73696219075.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/41dccadf5a283595d1857c76cd9de5ab/fatesimolinoxiwaruveme.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6af345296---remawilogisozofozowa.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/2f92f4799320fbbe7a2e47980d324c2a/pexiwivodis.pdf
    • http://i-harmonics.com/upload/files/potaf.pdf
    • http://abwingsva.com/uploads/files/79546746104.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/fkp6dhvv59s27kapta6q6upci3/22178305758.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16075159106780---82676712271.pdf
    • http://someteme.com/archivos/_20210623151454.pdf
    • http://skolicka.eu/foto/images/file/perirojeganipati.pdf
    • https://kovtec.pl/eurostyl/photos/file/61920335904.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8ec57a2d8---samukupugitataralomif.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/40757460260.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf67eed279---90734649189.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebf81464a4---72511173047.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=iso+network+security
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ab.bin
cf335907e647e01b67640c1643778840c1e21d01c38aa6ca1d8dfc0f32b2d573
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 10356 bytes
font_01_sfnt_off00010151.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10151 16792 bytes
font_02_sfnt_off00011963.bin
0934a11a1ff86c9407af1ccc6f0c2649b77c6dcc03c259161f9176b5867210c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11963 17456 bytes