Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a95e4306d6d672…

MALICIOUS

PDF

81.5 KB Created: 2021-08-03 11:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7ad03baa66d1203d9a9a6e4d43a3c154 SHA-1: ca8bc13737ef4335237e72f162528558bc947a86 SHA-256: c4a95e4306d6d672d951087b93d3ce4edd5945fa3ac32baafede7161be3778b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many pointing to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document's purpose is to act as a link farm. The embedded JavaScript, while not directly analyzed for specific actions, is a common vector for malicious activity within PDFs. The ClamAV detection further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://abicecream.ru/ckfinder/userfiles/files/rukapireserojor.pdf In PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/64ad66156b87c36427cb7f3738ef8cd4/48234166143.pdfIn PDF document text
    • http://aimic.com/userfiles/file/fegevejipegobotefozij.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f60374aa2a---wunis.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/tozizelebeta.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/jadogopejofanubadubavipev.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/javaxavadunexas.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/51790685080.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/mefisidikadogofome.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f03d8c73b---51117511056.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f497aa888---gujewujojelujed.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985326e6df5---8875356525.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/faf6eb8dee129641bf306122616d5a41/digimakorox.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/vopigabozazadidipoki.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160f9c5eac8f09---bedakanewawuwizedawi.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/tegujevoxamakorebibobu.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609842a33c7a6---49887230360.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/afe41188822a6f5056157f733d0b3f69/94942217218.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/3696791545.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/bixarafokijapixuxubesil.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088bf13cb4ca---gotoresagokixoximolojono.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/gekuwawilebakino.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/bonizoradusoxuma.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210703_225051.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/mojima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=area+of+composite+figures+worksheet+7th+grade+pdf+answer+keyPDF 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_off0000d7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F0 17180 bytes
SHA-256: c3389a9b93b190e2f9f7aec73a24a47a5f4e2fcc00afc2b7478913e24d923ac5
font_01_sfnt_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 11444 bytes
SHA-256: 25100ffb58c2d67d97d13bfdd316c2a05fa0fb16dc04aa7b320a00920a5098af
font_02_sfnt_off00011f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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