Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a78a3fc6fef9c50…

MALICIOUS

PDF

76.9 KB Created: 2021-09-17 08:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e5b4dd473bdea823bc56662be4fac5bd SHA-1: 4d9003c6015eed92e21d834ff6996aa3c63b20a5 SHA-256: 2a78a3fc6fef9c504b9d02733948df0259ebaa161e59e4c69a48e881d75bb40b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure itself point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://lednotice.com/userData/board/file/7303225434.pdf In PDF document text
    • http://spain-ex.com/images/blog/file/89071711017.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/60225237599.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/4164922449.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/betoxilizebe.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/73428371943.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/b94563ac81c14a6276b041dc9166ffa7/15211025253.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144089086a78---wufefenepulonejupegis.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109161626209811.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/lugajo.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/1075cc1c012ab34101432ff702b1f6ef/jololaduzuzewebixetinid.pdfIn PDF document text
    • http://www.bash.cl/media/file/gofasanozonodukusulo.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/sonedibixibajuxerogimizi.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/gowixapefuvigu.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/84124162118.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/xitebuzubuxasalesux.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/rozikusewulugumurizise.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ei3rn3hcqk7t45mk8n5k0e0rqe/rejawemaverutebab.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/4f9f7q8a11ok68crtgkamgnocj/biwapimetovusalupezejiti.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161367a13c847a---zerejetopazuvajinoveb.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210904152031_l3wrtr.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/kagasunasufatogagizup.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/63701729492.pdfIn PDF document text
    • http://evola.it/userfiles/files/6632046905.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/wonifimiminozevaw.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/18273114266139c053c79ef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=arcade+games+modPDF 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_off0000c9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B4 17576 bytes
SHA-256: 8d3194f9cb2ccfdbcb45c72c29e2d5a185af87cb6ea0e2cc71a2c62bb7672c60
font_01_sfnt_off0000f6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 10356 bytes
SHA-256: 45a2fc4481bc213176e65de61c8a8e77c466eeafa067693b70aaa8de1669d4a4
font_02_sfnt_off00010e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1