Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df8f01264d1eb92…

MALICIOUS

PDF

87.7 KB Created: 2021-07-21 22:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8b374b38de54b080bffaf6a279cdaae SHA-1: 69e33528b07954a96f9fef37fee219d19b28231a SHA-256: 2df8f01264d1eb92264c0442f1ea767a099b73eec6263272f63ab09a111ebb67
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage and disposable hosting. This suggests the document is designed to lure users to potentially malicious websites, likely for phishing or to download further malware. No scripts were extracted from this sample, limiting the ability to determine specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wcfkenzi.com/ckfinder/userfiles/files/2502186581.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098597d00d42---39547919322.pdf
    • http://capital96.com/userfiles/file/jaxatoxiladetazipezova.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940fcae2f54---kiwepumekikamofapuzaboton.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/de66a159e79d1a4637da7f93a883d6ec/54296803241.pdf
    • http://musorcentrum.hu/files/article/file/28620393490.pdf
    • http://naturalmis.com/userfiles/file/kotimekipoxor.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b361b12fc53---jivukixoludurutoman.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/68554099421.pdf
    • http://burmeseburmilla-allevamento.com/userfiles/files/kewomopudelazof.pdf
    • https://noddy.nu/images/file/dejutamasufu.pdf
    • http://hsi-international.com/ckfinder/userfiles/files/migabik.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d2d8a6e57---ditodavebolijowokovun.pdf
    • http://tebsc.com/clients/84181/File/loresagoxunuvagiv.pdf
    • http://pileshoppen.dk/userfiles/file/72404266563.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/2b413501d701b83489fcdcedf4ef7209/sesufotuwitodi.pdf
    • https://teyadegitimvideo.com/calisma2/files/uploads/76951280080.pdf
    • http://fritz-fahrlaender.ch/download/wizagolufibuposida.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ca26191d6001c18ccb79c8810451e43d/41210048877.pdf
    • http://ecolservizinettuno.com/userfiles/files/48042076812.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830bd686d09---28388005199.pdf
    • https://presentkompaniet.com/img/content/file/tuzifuvikegularijuvalu.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/5ea1fb4b87613174a9d8b15ea700fddb/37858221736.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+use+the+floss+threader
    • 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_off0000f600.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF600 16792 bytes
font_01_sfnt_off00010e12.bin
f47476c953d281c1cef46c21be44cf349ee869d000201756cd4a6f07727568ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E12 16744 bytes
font_02_sfnt_off0001399a.bin
97228405be97606123c52ae952ee789c62d51621491f110c801608d8f2830a95
pdf-font-stream PDF embedded font (sfnt) at offset 0x1399A 10432 bytes