Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6eb6247d06eccf…

MALICIOUS

PDF

85.9 KB Created: 2021-09-12 08:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b59e44dd8217504ea256fbab228c967 SHA-1: f843467f6c4b94b41b19856373b0ad1d2e11bdb1 SHA-256: 6a6eb6247d06eccf59b7591768d9560bf78187684e299c651eabdd17e63f34fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm used for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to trick users into downloading further payloads.

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://applecentervn.com/uploads/image/files/64392215221.pdf In PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/18112177796.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/48830729780.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/23135848956.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/99720828659.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/bidadunozomaguzisi.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/fotigapeluduli.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/gelukujujuv.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/wafidopavepuroxakibuzi.pdfIn PDF document text
    • https://ferropula.hr/files/59022607012.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161397a42e4900---wumes.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b9e8fb3b702e3d0c5450da3ef92fac87/62186196048.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/cdl7eh691ifo5s7g7lv5i3nvbq/jugeragafasevivoxidatut.pdfIn PDF document text
    • http://reopen911.info/media/file/tukinetikozez.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137dcfa50498---63045760716.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/mokuvamovakutuzeluginap.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/83080943025.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/98658666745.pdfIn PDF document text
    • http://erictex.com/ufiles/files/63084334935.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/xomozapowinugipub.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/17008714525.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/70815487838.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/51831851385.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/53644320959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=john+wick+3+full+movie+download+tamilrockersPDF 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_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 17576 bytes
SHA-256: be0e588bb7710358fc4cd383778854a461a321c1e0dafcf9a6400eb149ceebc3
font_01_sfnt_off00011708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11708 11248 bytes
SHA-256: aa25405d129012e10b5b45fb760d53895eeaec05f0a59a8aca1a674a0fc46154
font_02_sfnt_off0001315d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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