Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e68edeb2046ee5…

MALICIOUS

PDF

102.2 KB Created: 2021-09-06 06:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 76c68581ad055b0a3a7f8fb3ad6d5c4e SHA-1: cf7d5fb2dc34faa0a40f8b4a22d5f95c3b71bc4b SHA-256: 18e68edeb2046ee548ed686937b646f1c90f072865d8949ea44c433ab09d5c6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to lure users to potentially malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 http://gulfcoolcontracting.com/uploads/userfiles/file/file/dakivew.pdf In PDF document text
    • http://sheilahancock.net/blogfck/file/16609765253.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/kapozowuwedepujuken.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/dememafowebelokos.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/10b31d52c59964193cacb8c115e30282/21173580592.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/49291232578.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e905c9eef38---zumujejub.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/14109612312.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae01255997---17577092792.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/soladafepisopikevemigakim.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/pusugixajikimutefilagebe.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b14f7d9765547774330797543645618/85087637296.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd7be82265---6446795342.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/f464r052apj3ne7jrgtnjf8k00/wejijabowowitozetunimix.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/sijowelokopusikakowixinif.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611685b73ad31---nexagisumifi.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gepuxanosasezonadi.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/xevesiluxa.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/juvigebegidewudipenokir.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/sepojunarev.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/kamazunavakozum.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/51786635408.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/5r57mtr01q6vib8svret44fsmu/72992297086.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/dexusisigojubupaziwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=barn+burning+william+faulkner+pdfPDF 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
stream_004_off0001557a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1557A 21224 bytes
SHA-256: 0b7e388995e39edcd3c6f688d0ecf177fdbee09d57fe38a6d9abaf369e401eeb
font_00_sfnt_off00012485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9C 10928 bytes
SHA-256: de8d901ed7ae6b71bff1291d99eeb484e48ec4dcdb71851eacdf0006872eec27

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