Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1bb8012e8a2a8d7…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 22:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95342eddc0ac6ffc3e7c2f7e18d47110 SHA-1: 052c1f042d6f1788daa60c8e614d795b1e8782f5 SHA-256: a1bb8012e8a2a8d78dc4c05aeb5fca470623610ec01596b27b6423f6f75b56ca
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various disposable hosting sites, a common tactic for distributing malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method to bypass security scanners. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://huntic.ru/uplcv?utm_term=aumentar+velocidad+internet+android+root
    • http://hondaototanan.com/upload/files/xozuridifabesuzapo.pdf
    • https://xn--b8qxb801j.tw/upload/files/38242794866.pdf
    • http://ubytovani-budejovice.cz/picture/vtextu/file/75715603117.pdf
    • http://busankid.com/webfiles/board/file///dowotegino.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/3682213008.pdf
    • http://oilmachineydy.com/d/files/61412107253.pdf
    • https://trsoftyazilim.com/genelresimler/file/pefobegidiwaxarepowuk.pdf
    • https://youkuvpn.com/upload/files/65808876157.pdf
    • https://yenicekentkaplicasi.com/userfiles/file/nulegesagosazebesel.pdf
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/14803817123.pdf
    • http://karthikeyanjayaram.com/userfiles/file/lopivusixeb.pdf
    • https://skatrip.com/basefile/skatripcom/files/xipepajixaxobafena.pdf
    • https://trongtrucsolution.com/uploads/files/kumeka.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c039c54acd---vivomirimopuxesonaketonu.pdf
    • http://dansensvenner.dk/imagesfile///2769677740.pdf
    • http://akgwealthplanner.com/crm/files/bomapozubas.pdf
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/zuxigidugonojuluvaxu.pdf
    • http://beming.com/ressource/site-image/files/3596697437.pdf
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/fesubijaxakanujaj.pdf
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/temidixewenike.pdf
    • http://purepassion.pl/userfiles/file/velagila.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8819f2b4d---22852289916.pdf
    • https://btegypt.com/file/4924864241.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/13a3ed3e666af22f1f70cb9f7179f316/69073226511.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/f12746d204cf53245fc465b1aac531f6/97034513101.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_off0000d25a.bin
698c6a13a5148dd1b0df77f2031feb0b24c25abe581ec95dc7796ae2a9d7ad0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD25A 18604 bytes
font_01_sfnt_off000101b1.bin
01bb25b572bb0169c9e003b4aa9e60f2e66c354b638de808e4e5b916646811f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x101B1 10512 bytes
font_02_sfnt_off00011995.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11995 16792 bytes