Malicious PDF — malware analysis report

Static analysis result for SHA-256 555791d78824af3e…

MALICIOUS

PDF

94.9 KB Created: 2021-08-21 04:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9e8f453ea2810a0f1f14888f926d4c0f SHA-1: 786842f143478f82a5770d87a4bf0de3c40b490b SHA-256: 555791d78824af3e35525f510d38782b455dab0806180414f63760bb4ae4d59d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

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://www.globalnautique.nl/upload/files/zezitubokatifebofe.pdf In PDF document text
    • http://royalgroup.at/tmp/53529754988.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/xijufagoxibezixedoket.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/91976394669.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/30145323760.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/mezineta.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/94388597656.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/80918067118.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16107275016b3c---54156323974.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/d4u9s9rncfr00udjvaohknbvpk/binimenapofo.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c02e6eac84a---wamipalovarebu.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///10067234941.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebead24222---busatetavovemanap.pdfIn PDF document text
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/13726661835.pdfIn PDF document text
    • https://tavio.ru/files/file/ramamafupunevoveko.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/a83b55ac5cd644ffa00bac02b6f58ebb/8991265226.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/20719055874.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a48c55a20---sajegusidib.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/87748396718.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d728f77d098---9584156630.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/7406552161.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/puwutejivuvufowuxomov.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/nixenizisiwipexomolasebez.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/33495344219.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/funirojivafemepubagibupo.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/aa40e064c6113fd717d806fead300eb2/4679930446.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/dawidosekadokawudomufo.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/kevadozujigiwibexiredew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=worksheets+on+rational+and+irrational+numbers+for+grade+9+icse+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
font_00_sfnt_off000108c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D8 11560 bytes
SHA-256: 304f711ddb4badcafd95f237543fdbe92e27dbf11a39bccf6349f1c241ddef26
font_02_sfnt_off00013bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB2 18112 bytes
SHA-256: 26880ae916eed43832868b3214b4d37c72a0b5f5cde6d7d46c1289f1d94a1684