Malicious PDF — malware analysis report

Static analysis result for SHA-256 19eb5b0c6be3286f…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 07:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 446db1b67f2ed1d69e3cd22626fdf61c SHA-1: 8ceb8b764d03cb921a0e81afe5b5d1ccb2aa028d SHA-256: 19eb5b0c6be3286fed38cabe676b6d661daa9fa3800fb72ac9d4d699b57e8f3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links and SEO-disposable link farm heuristics points to a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://drafthe.ru/uplcv?utm_term=jojo+blox+codes
    • https://bikidi.com/UpFiles/WebEditorFiles/file/gatexajinojobuvawomebare.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/a09a9e1bdc04a761cf454d30e3e293bc/nosunigikek.pdf
    • https://sapsda.org/SapmaUserfiles/file/fuzadofadetesepa.pdf
    • https://redormiga.org/sites/portalin.es/files/file/pajuwubezelinokitusegaset.pdf
    • http://alarm.pl/userfiles/file/bawevikuxexatekufesikutut.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/1cc0809900b973a647a1c6fb6447a809/gafumidigosij.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/c29603983b51eeff076fd2fe8f5ae851/29659245035.pdf
    • http://hnkingdee.cn/Files/file/202192422226.pdf
    • http://jiji.pgo.tw/pic/uploads/files/61683446259.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/zomamanenekoropimosorude.pdf
    • http://onestep-tokyo.com/userfiles/file/92904281025.pdf
    • http://thuduchouse.vn/pics/file/55750805825.pdf
    • http://htygroup.com/upload/files/lavifunasowevele.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/kexowida.pdf
    • https://sanipacific.com/attachment/file/xibasiweretotilisovizabag.pdf
    • http://eot.mn/uploads/userfiles/files/faxobuvasefililinarolu.pdf
    • https://derya.afmiletisimajansi.info/resimler/files/tupibuvekex.pdf
    • http://abogarestudio.com/userfiles/file/ramosovi.pdf
    • http://eastindiaspray.com/suvra/eastindia_spray/files/xanedudowakisosuloduw.pdf
    • http://constantemails.com/userfiles/file/163141140970142037093.pdf
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/xotumab.pdf
    • http://galeriejacqueselbaz.com/userfiles/file/galuwunobiteruzitate.pdf
    • http://www.koeru.eu/failid/file/86978799967.pdf
    • http://cyc.cz/pictures/clanky/files/82535881069.pdf
    • http://janjoling.com/public/ckfinder/userfiles/files/49614778531.pdf
    • http://nhakhoanhantin.com/media/ftp/file/vibujobede.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_off0000b142.bin
8c72fb4e497fc1be0f56e2044d0968bbc4944b3f996a5afbfcade98bdb7f2c11
pdf-font-stream PDF embedded font (sfnt) at offset 0xB142 15376 bytes
font_01_sfnt_off0000d7ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FF 16792 bytes
font_02_sfnt_off0000f016.bin
54033932c74fb83ed2b8c19082370fb3a091a0824ecc27aa616838c01ac0e117
pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 10172 bytes