Malicious PDF — malware analysis report

Static analysis result for SHA-256 33be5e11a98fa937…

MALICIOUS

PDF

80.3 KB Created: 2021-08-16 07:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b91c8d333e3aa659307a119c856bdb06 SHA-1: 6c2aef6ac140765303fe1ace191ff9b0862c4041 SHA-256: 33be5e11a98fa9379f5ed25b443e1af8c489bfe1fccf9427e243bd3b22044ffe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. These links likely serve as a lure to download further malicious content, potentially related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://wastran.ru/uplcv?utm_term=download+fouad+mod+whatsapp+versi+terbaru
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/c4730ece7bdeca95310585e19c534d27/77857404649.pdf
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/sebusoxumotozap.pdf
    • http://julianowka.pl/ckfinder/userfiles/files/74722427753.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/de04b38c7b92d1e95645f6e5e32671ee/diruna.pdf
    • https://a2designbg.com/userfiles/file/66472370310.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/082a7c569115b0f46a94007e9d9f5a69/68641278869.pdf
    • https://loyallcanada.ca/editor_files/file/94550752372.pdf
    • http://anapharmata.hu/ckfinder/core/connector/php/files/fizomenanosez.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fde4f6eeef---12209405863.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/88b30de1e46ea6f423927d3def5565e5/96325245654.pdf
    • http://tate79.com/clients/868750/File/bisulitobagevetawisivut.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9dafdf15a---fojimorevosokamirevazoro.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904a9aea050---77948026001.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/a0umagvlq08pbago15sm6t5k1d/60560261361.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099f60b7ba70---xilabugaxi.pdf
    • http://coeb.eu/userfiles/files/55575620477.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a202dfc0233---kiwupobodarigam.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/wumijopitunatuk.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/2vmkgf3l7u2ajnog4skinco1ek/55135262949.pdf
    • https://alhasooncorp.com/Files/files/61725430261.pdf
    • http://nsfeed.com/_UploadFile/Images/file/21411771494.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a501bc72a0c---29717734654.pdf
    • http://mexxeopaint.com/upload/files/90301886587.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3b16b7bcc---78364930952.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_off0000d89f.bin
863ef37063a94ce15032d8e4f59ae8ccdfccc30587e6a897c82d70cee8a76349
pdf-font-stream PDF embedded font (sfnt) at offset 0xD89F 11156 bytes
font_01_sfnt_off0000f256.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 16792 bytes
font_02_sfnt_off00010a68.bin
477d31665fbb8fdf274d2f5f3b8e52a21ebcf6b8383c1a2a778bfe50091a7dec
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A68 15996 bytes