Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ea775fd9ecb4bf…

MALICIOUS

PDF

86.4 KB Created: 2021-07-04 14:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 839edf2deb342595fa96f7b64dc5735e SHA-1: cd35449c9fda9ddefea08e33c73da4d5c1752218 SHA-256: 18ea775fd9ecb4bff9ca092ce730fd01628b8e1bb4e15364e521a86c79c96776
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics point to the document acting as a link farm, directing users to compromised WordPress sites. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/sco3066rg819d44da807u1uli3/40875476904.pdf In PDF document text
    • http://xenangheli.vn/public/files/80642340139.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce0e47af59---xoxabulusotod.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f8fa0e8eb---vekigurux.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/j4t1o8u2ettkqhmpsb71emscaj/72131787176.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/isdjbt759o62p4878s2ejl55d7/fenobusexesodofupalifakub.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/56954421003.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/gebelezixuzegun.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a8b7a99658e5dd2923aeee8020f30c25/ruzawekodaxeginoweraxoj.pdfIn PDF document text
    • http://renovator.cz/files/file/xaforokutev.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/22757570594.pdfIn PDF document text
    • http://cecev.com/stockages/files/44678617736.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a002968b84---97198294716.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160767eecb2a16---57145959458.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/d970d2fd87ec15ef84a73f195bf39d3c/bifamuselerowema.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/7b6a536825f135ed98cac8e223b8135d/46560184464.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb774d4e94---manonibotirosanakifuse.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcb2ce4adc---xukabajotad.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/lolaj.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/repenevukopufivufepudibur.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/kumasupumara.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/gofaxoreranud.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/e6c04c60c72154a0430477a473576d1d/24279748694.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/40e964c710dcb4d44a336c02e421ee84/kederoxulofugoku.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/nvau5bvtjsigihcfsbifnfm8q1/lixedinadawixogi.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/86159839701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=give+love+take+love+quotesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 10340 bytes
SHA-256: ff9781a2b6ce9aa888780ef69e9174533d9a76a2d1669a0c3f7853505453dd93
font_01_sfnt_off00010933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10933 16792 bytes
SHA-256: b447464cbb50710b5f8161b1d1c4de3bffe5332c65881175842433c8fbd4ebcb
font_02_sfnt_off00013449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1