Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f0830d5f7f49b8…

MALICIOUS

PDF

96.0 KB Created: 2021-07-04 21:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7b49d9bc8c9ece33452fe4d5783dd412 SHA-1: 0f52051543aae4a938280efb1568cccc166471d5 SHA-256: 10f0830d5f7f49b8fdfaf997f0d2e1d9705cb135ab1e0d7f6e11d4c9cf9304d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of links pointing to other PDFs hosted on compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or phish credentials. The embedded JavaScript is likely responsible for initiating the download or redirect process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/32e9mkcdk912dcj7rfvq67gs51/foxasubupukumiduv.pdf In PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160821669930fb---76890807361.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/24673764928.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/50698039962.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/55416295812.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9108243b1---rebulavoredotaverasokovus.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcfc0d62e5---zevodofusujo.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/30680187113.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/akgppr91k32k8hrn4t47p4q1qv/35057920992.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2b5ce5533---39799730183.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/88570755555.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/a905d8a3a99a87f1b33b227064c10494/lokusomuletogi.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099476bbbc41---sapanomamopotedulipokefe.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/25pg494auolekrvl0s29j8k145/24481994813.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/r6178b8mjri1ug78ee1ilu8a72/wogikalapolorobe.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8a54ea72---medetepeg.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/buluperipapejusuroborak.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/7df758c451f7fe33508cdbca72e5ceb1/wejekededosajevon.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2de04ace8---pasagimevolarogasivi.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210609_F592BCE53511E317.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/2ea341cd150b82b244c7b6fdd28347e3/40519275407.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/waxifomisufizofunov.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/61704813924.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/weduloganafokonos.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/gomajatuvasizoga.pdfIn PDF document text
    • https://medtek.vn/storage/file/gawotowifodilesuvulawe.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/pufefalonaja.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985544bd6dd---51371262367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=chess+first+10+movesPDF 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_off00011494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11494 17636 bytes
SHA-256: 5744441c646a0f2ad9bb4f85299b46d7be977c44871556d1eda8f4b1b2418c31
font_01_sfnt_off000142a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A5 10436 bytes
SHA-256: ae0646be6cc0810f1432922ef95797fc81b96901426ad4a4e3a3b6d823b624e2
font_02_sfnt_off00015a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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