Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8d1e0c83264b05…

MALICIOUS

PDF

73.8 KB Created: 2021-09-29 10:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b253fdda8d181f1b12ef14dfaa719f30 SHA-1: 608de2601537e7543a3e9f6453a03d412cd3eab7 SHA-256: fd8d1e0c83264b055817f949c257224b402984b7a967df062edecd17f6e3da4e
156 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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 https://catamma.ru/uplcv?utm_term=zero+to+one+pdf PDF link annotation
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c2434bf6265306413d218ab6c49d1fa3/lexuzakewidolixupatanur.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/4711011771.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/24384037731.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/25255526617.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/6771498682.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/xixekerojenukifoxewewubiv.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/supafolezigijuwisinejepog.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/26826137157.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6bef9573a---pusawikifodel.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/rotetixavulunow.pdfIn PDF document text
    • http://spynet.gr/Administrator/uploads/userpics/OutPostImages/files/topanewipupupovudofuzo.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/b6e6c88b7b775637e0dbf2040b82318f/94559325532.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/kigefagomepuxanazoxinov.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/fodek.pdfIn PDF document text
    • http://epmachine.ru/d/files/ruselilolege.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6cc5dcad120691ce873993ad3884c4c8/nununiwizem.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210924103512.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/19115583639.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132a29990c3c---50753043439.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/86684437755.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161496c1f37704---54060998112.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/31139485618.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/82098739570.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/27518327661.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202109021457123723.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/masadagalabukikirenepepop.pdfIn PDF document text
    • 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_off0000b7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B7 20012 bytes
SHA-256: 47865d33c25e36bd416f5cbd35c34cbbde92b6489a8a8b5bfdd8e3bac3b5a23b
font_01_sfnt_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 9984 bytes
SHA-256: fc46c7c3ed794cc27a53d9bdd961e848bf5add4b6bdf017966f63924125b02b3