Malicious PDF — malware analysis report

Static analysis result for SHA-256 8806c6f6f3680033…

MALICIOUS

PDF

89.5 KB Created: 2021-09-07 04:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fb70638b8f9d7544fed23e2b2331a1cb SHA-1: bde255d57d7d5e03e5a6bb2ecc9cc7e243d0af4a SHA-256: 8806c6f6f36800338d8341af343fb2a4b0cbcac656005ecbb68c1ada73309060
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://crysiq.ru/uplcv?utm_term=boston+t+map+pdf PDF link annotation
    • https://alwaysthesame.pt/site/upload/file/borexekemi.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/udvqnjcdhr8f5jrmkjhd13opcg/49120330068.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/21178300896.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/xejatu.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/81095737331.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/mapomebes.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/94166874499.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/javodutagarurezu.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/87008334715.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/n0smtd7bsrr997bsms83fmrp0r/28098051114.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/27074338466.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce0efbacbe---29604287399.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097186cabe23---taluro.pdfIn PDF document text
    • https://strechybenesov.cz/content/67429447310.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/fcie2hs48e8b5hlb4ctiso78vn/55222050379.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/75584671804.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/kirowibavizisoliwexexex.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606effccd8120---wazegixoxegogekizetedexa.pdfIn PDF document text
    • http://juha.be/_files/file/67015083892.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dbc930ae0---xeduxavazusixod.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/rawifi.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/546fc787f8c173df95033bdc4264fee6/fexavuninilisemadabekexi.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_off0000f8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BC 10344 bytes
SHA-256: c7c97bec7164bd2a596d57fb7e5de9d816b7f1bf1ae0d7d2e0935c8648944142
font_02_sfnt_off00012816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12816 18524 bytes
SHA-256: db3c1d5d5e705e2c49fdc26b630d58ebb681437369951543b5cd37b345add794