Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ccf72935e94721…

MALICIOUS

PDF

121.9 KB Created: 2021-06-27 15:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9574f38f54c7103f41baac416a5f27f0 SHA-1: 31893c65084e3d9e35ff07e4c864a58581624f9b SHA-256: 83ccf72935e947219dcddd70ace113681574c4012e6573b19146e6f3c0ccfa08
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/99d7430eedf97cf83fabc7ef43f037eb/govil.pdf In PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/16ad860f84d70312efea342e3e577d1d/zisosonujukabulemet.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ne2u005i3nhj8d6nkd7bu273b6/94614404736.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b37d80a19---xokanuzumel.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16087b8cac45da---47705737374.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/92346791153.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/5a4c65d2190cb9027721f444e72734b3/sukenuxeburunoginizafum.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/75cc34e64e5c80a7c38b7c51e2ae910d/ditasutoseva.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/8791153845.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/6200b1565a820d7dfbd237501e5dea58/18690546667.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ukujod40f0vvkj008hm8bgffig/21062602871.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609f73a264689---desolumutan.pdfIn PDF document text
    • http://jarosi.hu/files/file/57092912444.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/kojabefubevufazununalib.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/q2rceohfl96ro0vac9vj2un6ek/xakonaxenafelenamuvidun.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/wenoxexamigekokadozif.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096808a35b36---8143830847.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ad95c2ed3---63688441847.pdfIn PDF document text
    • http://poorclarescork.ie/images/zugejixejoso.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae2dfdfa6a---pomelobaxokoka.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/50153fb8b342f2c1641a469c10814b34/butiwemetipasiva.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/917b97eb2efe174d7f9212eb931b5788/pozurad.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608244246471c---11450442211.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608191c94fe66---17568697871.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b6021eeacd5---80395175993.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/rivf176j89cfhsif29ldb2p3po/delalapugarusotexo.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/e7c696228de0de4fd80549eb3152e33b/wosufesuzojafokodejaluf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=you+threw+my+heart+into+the+flamesPDF 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_off00017e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E64 10764 bytes
SHA-256: 17cf502f8fa2030d53356980ef778976b7e8674ba3b924b4d89d170ab219e622
font_01_sfnt_off00019707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19707 16764 bytes
SHA-256: 2bf22e4b4832cf409de2250df4fcfdcf9e25614985f5cd7f80343db5d0531116
font_02_sfnt_off0001c1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1