Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8afd7348fdb8056…

MALICIOUS

PDF

91.1 KB Created: 2021-09-06 14:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0053cdceb192bf3b8d2beedbfd92a0b1 SHA-1: 13f321addcfff2459d915a21d5d1601f0ca3f40e SHA-256: d8afd7348fdb8056fd0bfd47cc763e9943fb7a0385ebb0fe86f5f73d31db0550
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO spam. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=think+and+grow+rich+autosuggestion+pdf
    • http://sdds.be/userfiles/file/bepug.pdf
    • http://fatfailogistics.com/fckeditor/files/file/65850058463.pdf
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/nogenebekekasetivav.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/110fba88a3e66c135ca9768915ee9d44/napebutulupun.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe76827d30---60714212643.pdf
    • http://planetamama.ru/files/file/79591687983.pdf
    • http://gwardiajuvenia.pl/zdjecia/fck/file/kijikapokewiduz.pdf
    • http://riskhedgetech.com/uploaded/file/553388237611bec5cc8e05.pdf
    • http://palazzodiaz.com/userfiles/files/worubi.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/775501783b0562dd5b16cd7c60b32115/49523267490.pdf
    • https://hotnews.md/upload/userfiles/files/lamixikubajakomo.pdf
    • https://twinscooking.nl/twins/userfiles/file/nadoxileg.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160879d08ac15f---xepuwakugojokokisodilewe.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/fopovelebatopuwuta.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/63294caf8bd6d5d640b79837b2322ebc/6318597853.pdf
    • http://jgbt.us/pds/userfiles/files/52451058492.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/8a7818f5d4966e389d0a815db4bfc154/donemukofiromejobiv.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f16fd2185---siwasojoruzitejexevotopi.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/b6b517d0e2f77f7143c703450416c627/xirojida.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/026744b42aa55364b38baca933a68689/6159007463.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39a9fb9e7d---dakeminilejawip.pdf
    • http://www.anclupnapoli.it/userfiles/file/88053567509.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16086904e3a40c---kopif.pdf
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66138494261.pdf
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/sozarepu.pdf
    • 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_off0000faff.bin
3588149d668527af866cec64fdb8eddde9057d82232388b42c8f8d515f4e21c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFF 11096 bytes
font_01_sfnt_off000114b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114B1 16792 bytes
font_02_sfnt_off00012cc3.bin
e0dd5e3485e6a1cae77f004b6b2d7c4919aa73847745660a0cbba0c702f18739
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC3 19136 bytes