Malicious PDF — malware analysis report

Static analysis result for SHA-256 09fcef1e1d9c3e6f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 16:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bcad7e43881a49e70917f824204b4eb4 SHA-1: a34c4b7abc2a1d2e271f345eb6eda33ba627474a SHA-256: 09fcef1e1d9c3e6fd3bab425ddea823e5a1d26a68acbe970eb10be9011185e57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. ClamAV detection and ML classification further confirm its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://starrsgazette.com/admin/images/file/rojox.pdf In PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/0567d406d62677491d66ccfa204f52f3/naxevokeweka.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/riximejufomixepesere.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/67891995442.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/0b62b43fadff35658aecad889762c42d/72061070579.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/38957450164.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f8d24b87f00---suporexitediwaretewipoba.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/72881181647.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/23896789041.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ca9bc831d8a---xoxijolu.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/wawavarugad.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/85977126890.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a477e5913b1---24080161952.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/majojubiforekurunegotaza.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/danarefavolozije.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f12226f0a6---tefake.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210718_3C806455FEB94286.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a0c798c5f---vuxavinivifawixatolarama.pdfIn PDF document text
    • http://wwstationery.com/files/file/7598273659.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/fabekowofonoxile.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/fitinurerezejom.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/e43344ca40e1688fe1a5f608de60e450/52261058965.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/bugavegake.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/lanoxud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=manual+de+oslo+sobre+innovaci%C3%B3nPDF 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_off0000d70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70B 10700 bytes
SHA-256: a011ec82127c563909a4b6a3c6b8d238a22a0d268dc2aaf04fbc11dc77832a88
font_01_sfnt_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 19064 bytes
SHA-256: d90825d8d8c4783b36e3bb2e6815e857c33ec793ff9b49a27eb7728346b53310