Malicious PDF — malware analysis report

Static analysis result for SHA-256 e245ac2f3949e257…

MALICIOUS

PDF

84.0 KB Created: 2021-09-14 05:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a24b72195daae5eac93a29a9dfd67268 SHA-1: 1d82f3d986e7821876306fc97994bcaf9a4bece2 SHA-256: e245ac2f3949e257388f27e2dfb0168f6f0ad3c0249860145d8f721d50823c23
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-distributing sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=how+to+make+a+live+wallpaper+iphone+7+plus PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613715a5c3b84---virawetekupunaferu.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/tusemorodobezex.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/tajumifipi.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/75665088569.pdfIn PDF document text
    • http://trivio.it/userfiles/files/wubirerevel.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/mujozuwetibovufekexowit.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/68891222959.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/55388147976.pdfIn PDF document text
    • https://peterdegendt.be/file/wusudofoforovekegutofim.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/rupedileridu.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/jabebab.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/fabezumuxifudidamujowun.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/vinenegenuvi.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/91767844446.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/49525067583.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/xelikawivejifogekesa.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/15483679e14cf13aaaf2efba8f4ab25f/jamosebejimatovomexe.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/78999173486.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/43955564290.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/wavujusuganelik.pdfIn PDF document text
    • http://pneusmarene.it/images/file/wogakiwemixebezopo.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rizolerowodibizonusijipi.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc041f26fa---beniwixukadozi.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/rilejozoxaxete.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_off0000e178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE178 10904 bytes
SHA-256: bcb670cc8bbae47bd2a2a0b2a13731150bf23ee93ec9461bc7370f236989b0af
font_01_sfnt_off0000fa8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8A 18208 bytes
SHA-256: b5ea763cfaf5338dc71ba897b6215f3ba4e97b4b26d497ac802c55bd5d077e4c
font_02_sfnt_off000129c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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