Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f935d3f2cf9b3ff…

MALICIOUS

PDF

86.2 KB Created: 2021-06-30 17:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6fb3c25810e9951b3b4dc73067a327d4 SHA-1: 36fbe5c5b4699f743c05fac85177737c03fa3835 SHA-256: 4f935d3f2cf9b3ffaebe669a2d548b476c829964945ee7c356bded12ec1f08c6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics confirm the nature of these links. ClamAV detection further solidifies its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/p3phi1bmbpiaa7btb88853d1i5/tonazutepenobag.pdf In PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/b02f134bd2b56fd82582619236e6bfc1/dubududekekalowimat.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/nagejejomusamu.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6f73aee65---79843072650.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609467032e47a---58959295734.pdfIn PDF document text
    • http://matras-devison.com/upload/file/98860472940.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096caaaf3223---28228158280.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/8c6c7fae9fedd2cbf2f8a0892b9ff15f/birinafewipawani.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/sabino.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/59530490364.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071827ecad18---xelewunenuwepogamolu.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/650aaabbd8a857555756c251314ecafd/xodel.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/98603785424.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/mgjcchd8oanodqc7pjppmjekou/89882021502.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609884f39f4e4---toguzovibolosuxav.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/b4e13f2be79dfde3d27b94f269b50f5e/nuxakakurowatanumiliwug.pdfIn PDF document text
    • https://ancoraeducacion.com/images/miwevevedijixafalevojipaz.pdfIn PDF document text
    • https://ikima.fr/uploads/file/jebuvisit.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/xijinixisovagudupakareva.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/dedofuweluruvizapovip.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/2g2bo60acgkavt99ensg88ih4a/11210715619.pdfIn PDF document text
    • http://svx.su/ffile/file/59229739633.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bddaa3715---donamanuvipoxivinem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+get+free+fut+coinsPDF 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_off0000ed75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED75 17516 bytes
SHA-256: 410c2447dd1d58a973e6c8356dc3d8184125a84cf77a46dc2071e757613fe029
font_01_sfnt_off00011b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8A 10480 bytes
SHA-256: 9b544e2c0b2c9a275c73cc7bc1ace86f2a522ac7db9a8b34844060e78243a86c
font_02_sfnt_off0001338d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1