Malicious PDF — malware analysis report

Static analysis result for SHA-256 1818e35acac710cb…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 04:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04339d33cc8ecb628c88cfd31c2f6506 SHA-1: ce448718cc5a2ce9808fb994db0a86a1d8d28f71 SHA-256: 1818e35acac710cb3916ece8c6374ba5f7d8a6bcd876dbc418e6724ad3794211
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample, but the extensive use of external links and the nature of the heuristics point towards a phishing or drive-by download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=streaming+hollywood+movies+online+free
    • https://pioneerlift.com/upfiles/editor/files/51604166048.pdf
    • https://maftplayer.net/calisma2/files/uploads/sejekuxulujotavusakax.pdf
    • http://dalnoboy.org/data/filestorage/upload/files/57072475908.pdf
    • https://cursosadistanciayonline.com/medios/files/66750927083.pdf
    • http://abwsalisbury.com/uploads/files/zavov.pdf
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/fuwevonabelenimimojigaro.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613275bc3aeeb---64049492120.pdf
    • https://vongtaytramhuong.vn/upload/files/91440749441.pdf
    • http://xz-brand.com/ckfinder/userfiles/files/20325568315.pdf
    • https://confidence-ist.com/ckfinder/userfiles/files/giziduparivasibigezegila.pdf
    • http://datong-travel.tw/upload/ckeditor/files/20210906105404.pdf
    • http://eminenceinc.com/userfiles/file/71984794462.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dcedb3f8b---47055445367.pdf
    • http://ggmtc.net/userfiles/files/49513247888.pdf
    • http://botosani.ro/img/uploads/file/nemabododudu.pdf
    • http://iweldbot.com/ckfinder/pho/files/54939138794.pdf
    • http://pobierzplik.pl/uploads/files/regujadosetizotabu.pdf
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/tafukezobogerimeja.pdf
    • https://ingatlansos.hu/images/userfiles/file/vepomikejin.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b6f050b21---26700060844.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e5c19635884685889e6d2dbbbcd72f29/tenegewupoxagovopukamizo.pdf
    • https://sealand-pptc.com/userfiles/file/fuwowuvujebaja.pdf
    • http://malifer.hu/upload/file/lotapuvubibo.pdf
    • http://gemmacapitalgroup.com/foto/file/26233871707.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_off0000d68d.bin
3257d7ff4fc040c413791161eccc5df971d99d3f398d9fc3a7c38fb921130fa8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD68D 17188 bytes
font_01_sfnt_off00010280.bin
662fd035d0dfd6bb93bead9cecee8b8c3cde923227fc5c912f31c51082e0bee8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 11144 bytes
font_02_sfnt_off00011c33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 16792 bytes