Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec783ba226fcf27…

MALICIOUS

PDF

173.6 KB Created: 2021-07-19 13:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7680e2e24ea6cd3cb767b3a608864400 SHA-1: 9398b9200260f08e4e9fb1ff7ea3be40127e70d4 SHA-256: cec783ba226fcf272ab88e7023d5d9e30788de38d5091a8c23f34d3c9e1705ee
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests it's designed to redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://detectiveoffice.net/userfiles/file/79282083994.pdf In PDF document text
    • http://colafranceschi.it/userfiles/files/fisudonebibenowol.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/ikqfa4ob6iqaskh9f40s55jorq/8511740376.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/86901013548.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc4bc2470---jiguzakekuwi.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/tidatibalideguges.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///88001061748.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/evuvehtc34el6m11m90p475lp9/30366272006.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/j462ck5qq8739adt0u56ehuud2/jagudibib.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/448475ec3b0ee6712d6e6f36eecaf9a2/50312633383.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/a628097beed248eed960f456ba5cf947/xubuno.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9acb310661---91162857861.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7fa5acc51---pemenaxemakakegixotevo.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/22037112965.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/mulevigagupurugirutulix.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/d3mdf8oj39c4c09dohkqla5b43/71809421649.pdfIn PDF document text
    • http://cissi.it/userfiles/files/jenunogemovozigazipori.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080b18080692---20258094065.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffd7fda6ae---zawujerupirukusunodugeti.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1a34ae97b---potejofogijemus.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/05368b8f6ca036a74aaa311d8da258a5/balebesaruridawigotu.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff37ee8c0c---61206758993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=use+reform+in+a+sentencePDF 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_off00024b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24B0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00026321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26321 17512 bytes
SHA-256: 220c5f8db2f9f236449c1b0767fe429024e3cb0b4e711e6c283839e36be310e7
font_02_sfnt_off00029114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29114 10460 bytes
SHA-256: 5bb22fb38102e2c111c7245ee35a3fb6d0f842055ca71308f82d39040918a0c4