Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87bfde75e89b9e4…

MALICIOUS

PDF

81.9 KB Created: 2021-08-14 05:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 825b30a96d5e0492fcb17d7dfa70b60d SHA-1: 15d365439338297fbb3e4ab39ff2b530edee3e97 SHA-256: d87bfde75e89b9e44348c22ac171e2eac0ba89d1052df191e3206b4d215e007d
96 Risk Score

Malware Insights

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

The ML classifier strongly indicates maliciousness, supported by heuristics identifying the PDF as a link farm. Several extracted URLs point to compromised CMS upload directories, suggesting an attempt to distribute or host malicious files. The document's structure and numerous links indicate a lure to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.firengo.com/userfiles/files/darujekewevixamogito.pdf In PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/nowulenaba.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c88d695940---febasubitujebumafupi.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160af8c1e1111b---tamotisuravogevuxubiti.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/83853303801.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d528a87dc129bb834eadb339346e2301/99380258243.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/8ba74c75d6e556b41a318cfef6383cc1/69343698721.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/77197375075.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/boxomudexirobojubufasi.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/zikazozumibis.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/90003023565.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/09fb960401a7a566702610165f9722d7/98777279125.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/bb399ac1988f7ee338cba9822dafe834/satumotapo.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///64184316422.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e6967f23b0---velale.pdfIn PDF document text
    • https://cristalensi.com/public/File/godagiwodisog.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/ditipoxozigisexitotox.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/39771884161.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/pls3cc2n0o58fpmsm7pb0q7pj5/mizezofabokapobarajoxabi.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/53882062934.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/28109118613.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/3114732244.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/85765470255.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/rurugavovafixi.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7313bbab3---28060045700.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607481ca03a8f---juvaxirolikizina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cyber+hunter+lite+mod+apkPDF 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_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 19360 bytes
SHA-256: baabc3e7b14258d9052f48b386780d7fa73830b7be0de019ff7f61b35b16d71b
font_01_sfnt_off000108bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D6 10964 bytes
SHA-256: 66768bccc3405971fbaef8533acd514b3115f7e346f8f49575ed7d2b3cfb8c75