Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c7aac01adac140…

MALICIOUS

PDF

82.4 KB Created: 2021-08-19 18:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 94e426d98ff35d56511f50c1032c3a6d SHA-1: dddf285cef8958c91213fa55a187fc857c59859e SHA-256: 50c7aac01adac140575fe17f66828b9d5523050e8bcfbd9005765ff85f10f85a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious link distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • 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://plentis.eu/ckfinder/userfiles/files/94297147278.pdf In PDF document text
    • http://megalaserasia.com/upload///26369221444.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/28770049018.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/kubededamamugesololamidi.pdfIn PDF document text
    • https://starbox.fr/img/files/guravadox.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/70233094271.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4ba002c17---9780994358.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/cafd556b818d2b45cade2a11cac04be0/bumuzonenasogafofow.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ac3026d4c---62728269339.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/zukutujuxuvuza.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91c0cb4474---89404403545.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a660b641ba8---vutevidimowapeju.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e85e25818---21490161531.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/1d3bda5ffceb3155d08c3333b2cf2089/witoro.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/dupugubuxojemixufukifafi.pdfIn PDF document text
    • http://polletnv.be/uploads/files/nafizenufajamex.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/38244402353.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/44342173475.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/judute.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/85555656270.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/sgbc5qhq1n005t0d6jinb10l50/wakofodules.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/bijagivagitebaxu.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/3iit9qvaqfl88lslk8fsud851b/sigabuzogurizoxekopi.pdfIn PDF document text
    • https://brakos.it/file/33119874697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=minecraft+mods+magical+girlPDF 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_off0000dd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD05 10812 bytes
SHA-256: 2acda8868393e831419822ebf6161fd50d1e7b134f62c15d4ac535fff733baf7
font_01_sfnt_off0000f5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 17220 bytes
SHA-256: 80099ee318aa8eca6af635bd15e8f0bf2c7e2db6cf0f24176d95f890953c24dc
font_02_sfnt_off000122d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1