Malicious PDF — malware analysis report

Static analysis result for SHA-256 b955bfa2838c5b93…

MALICIOUS

PDF

74.2 KB Created: 2021-08-30 17:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b6b7d79d444d46708924aaf7f6046b7c SHA-1: e7cfc0b52302c7ef9a2d69bc5b3d2e79bc155272 SHA-256: b955bfa2838c5b93f186d5c4995c094d6d2ef156c5dd8e1fae4ac94829e1082b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or attempts to trick the user. The presence of numerous links, many pointing to compromised CMS uploads and disposable hosting, suggests it functions as a link farm to redirect users to malicious sites. The embedded URLs and the PDF structure itself are indicative of a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://finatwork.com/userfiles/file/54583324420.pdf In PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161273ccfbe91e---94666034019.pdfIn PDF document text
    • https://motiv8workout.com/up/files/xonolabena.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbac589730b---loginodivifawisiwevenafe.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160762e35d1380---dukexuwevarab.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/kutemodejifutanajison.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/fj6tvau7eha527b9elnofqo4kd/rodevavatulusajidelo.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/31292403248.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/fski07egvi3q3b1vds2kss067r/85856651384.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c6e0e93d2---92055831602.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc92c254f7---21515370249.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160da10ee1667a---bopoxagulo.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/76ab0846e62b061016f8b6da9a5bd15a/85077317186.pdfIn PDF document text
    • http://fruitvita.com/files/files/9011056362.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/ferinusapirebojuturo.pdfIn PDF document text
    • https://latework.cz/soubory/13472363181.pdfIn PDF document text
    • http://jkohut.pl/file/40101327198.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/v5almji7t5l7vu6921h8p30m1r/93780002226.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/9752a2a3b0bd383fdc806a1d5aed198a/kiwakajesivodefomaviw.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/49mjnvcieehc1s7m43nat0l298/jinevilomoxeg.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ced80d8323---jizodazozozetenabutinirup.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/ab52a59701d321f5142e6403dcabde2e/kokejikosugexetasamusuto.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bdc3af945---14891744995.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95c9f30636---80581433922.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/38860592925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=common+mistakes+at+pet+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_off0000c16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16A 16648 bytes
SHA-256: b70a10bf34c67de076aecd303053f6c9d0d0e98a4f76a4a3110ccb4689cb6238
font_01_sfnt_off0000e93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93D 10636 bytes
SHA-256: 3b503ebfc833f260ca5cf970bf16bad3486df40794ee2aa60c9781e0885929d3
font_02_sfnt_off0001019b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.