Malicious PDF — malware analysis report

Static analysis result for SHA-256 289c2732496b4272…

MALICIOUS

PDF

74.3 KB Created: 2021-09-19 10:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea4e494f891a3f1f7fa9dffe9f7a3a72 SHA-1: b95fdece00dbe9805f3d18a5e88386b45e5ebaf4 SHA-256: 289c2732496b42720565748ac414befba5c4a4a44eb69629c365a7fb4a9e4e5e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The document also features a large number of external links, many of which point to compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://k-barrierfree.com/FileData/ckfinder/files/20210903_E0D2E72364AE3340.pdf
    • http://missteenqueenuk.com/userfiles/file/42679500793.pdf
    • https://marmetal.cevhertemizlik.com/userfiles/files/12137172120.pdf
    • https://remont-bez-zabot.ru/files/file/50229184268.pdf
    • https://rajakeempat.com/contents/files/32103582373.pdf
    • http://www.szphotar.com/admin/img/files/fidixakagavoz.pdf
    • http://tomei4x4.jp/js/upload/files/42945406406.pdf
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/kutijipepugojabip.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d4c7f8e8a15417241b3d52d973d1b3a5/392216772.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc0deb774f---12383010791.pdf
    • http://belloverde.net/emailer/file/vumof.pdf
    • http://quaint-house.com/images/blog/file/84014265005.pdf
    • https://drjou-vc.com/upload/files/32295876164.pdf
    • https://jiu-hang.com/upfiles/editor/files/75475601405.pdf
    • http://whatcanidoforyou.eu/publish/file/lubarosefamofiv.pdf
    • https://tanhoaphat.vn/userfiles/file/reridejujuzupurijaweno.pdf
    • http://open.ua/uploads/ckeditor/files/32063225013.pdf
    • http://ls12368.com/userfiles/file/386444168.pdf
    • http://hankyunget.net/userData/board/file/bimosudazogekixevulo.pdf
    • http://ngoinvest.com/uploads/ckfinder/files/50817219262.pdf
    • https://goldenlinejsc.com/userfiles/file/10084120299.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/5p23nhuap3gusc2socarsucl0r/nezetimulupefuroxe.pdf
    • https://copperscraphandlers.com/ckfinder/userfiles/files/99870981838.pdf
    • http://nhatrangpalace.vn/app/webroot/upload/files/53798908834.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/adf93572f69e2a97bc05b687bf291c3d/fimidapadoribomasigazol.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=iphone+not+showing+as+hotspot
    • 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_off0000bf76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF76 16792 bytes
font_01_sfnt_off0000d788.bin
8e1092ddabec45f6476ffa5b245e0ef6515fd45def4c3d77049ab85554544abb
pdf-font-stream PDF embedded font (sfnt) at offset 0xD788 17320 bytes
font_02_sfnt_off00010419.bin
f47f5c348d3be20aac93c3c87cbe080d0fc4b4f8d39f5eef05ee5bd181737bd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10419 10424 bytes