Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23752aaee540603…

MALICIOUS

PDF

85.3 KB Created: 2021-07-21 02:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd2555166be10dea2f3912759b1f24b5 SHA-1: 9419b7ab9ba3bb6ccb76dcd7a1ae4206001ce4b2 SHA-256: f23752aaee540603332e25cdc73984dc3bcf55b0ab73d3bb277af89119ed9663
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious websites or download further malware. The presence of multiple links to potentially compromised CMS upload directories suggests an attempt to distribute or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/51fce7f5b836624ca64130e4dc812b52/50605107573.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb74c5a710---52128630089.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c468227bbec---66238419219.pdf
    • http://10glazsikeyrosa.ru/file/venetukoworanok.pdf
    • https://rrr71.ru/upload_picture/vewozamijozokanidaxeju.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774913113c3.pdf
    • http://pizzeriagiganti.ro/imagini_ws/kisuxavodef.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608103d8c8846---15374115960.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2507b7cd78bf877f5fa01e0d5ddbc4f5/24285733625.pdf
    • https://bloc-immo.com/images/sabeloxojazo.pdf
    • http://burchiellati.com./file_fck/file/33828097610.pdf
    • http://ytbozhuo.com/upload/file/211650397189.pdf
    • http://0965818789.com/CKEdit/upload/files/21253000567.pdf
    • http://rilta.net/userfiles/files/noxozotinamodilopipuxoz.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/zizefamulus.pdf
    • http://usaoxin.com/userfiles/2021-6/file/sojarutunusatoge.pdf
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/53402056225.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a8205bde6---jutoxigagiligejapov.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2841e163d4---48532285025.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/roxojawonaduxorizumo.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/1144b17f1440c6d838fda8e35a55c47d/komojagakuzaxilazategel.pdf
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/66817512725.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/7bd7cd3557b81caf019ac6f8da30993c/13593718784.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9aae0e2627---86484412028.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=diversity+statement+examples+for+job+application
    • 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_off0000ea63.bin
ab045df4f6adadd5aafa54dfbc3b508e0873af3b2bb19799e1258c2d0a3955da
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 11192 bytes
font_01_sfnt_off0001046e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1046E 16792 bytes
font_02_sfnt_off00011c80.bin
10ac937327486c9d27afd21e276f8501cb69749298d442d0519651bc771a6188
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C80 16796 bytes