Malicious PDF — malware analysis report

Static analysis result for SHA-256 d486204b25d8b5b8…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 18:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e4d7a05f46fe4ec7a091b0284e88ffad SHA-1: 36db389cc7257324ecaf8203afe7601b67158e64 SHA-256: d486204b25d8b5b8ca9ec5fc62812964c1f69619bd2c704bbccfb0d26ce6cdcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate it functions as a link farm, with some links leading to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://lesartsdansmonjardin.com/userfiles/file/20210906213214.pdf In PDF document text
    • https://virker-ikke.dk/files/xejetite.pdfIn PDF document text
    • https://tavio.ru/files/file/37651899179.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/rawirezitapini.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/31393779916.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/50643482866.pdfIn PDF document text
    • http://afslab.asia/upload/files/27059895600.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/xipaxagutot.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613809c01f16b---fudasuzasug.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/78092733783.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/71965709496.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/rvohoj6sqbf95739ubf6p96l7v/fewivakaladikufadu.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/pugodunerapi.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/75424311249.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210901_F8899F95F16D210F.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/26510944906.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109060351218402.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130527f6ef1a---piwefetogitujeperogefomud.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/dixevisazisuxi.pdfIn PDF document text
    • https://steammining.com/userfiles/file/31112589925.pdfIn PDF document text
    • http://agro-partner.com/Image/files/tukezepuzekadux.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/54454263569.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/lk5aqctv2oguemo4l07p2d6tp9/21598091531.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/xofenatiwisotizesumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=merge+images+into+pdf+pythonPDF 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_off0000de38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE38 11008 bytes
SHA-256: 14e09bce236864664c2dcf40d0b418e2cc3a4067c03cdeb79807b0974813ed41
font_01_sfnt_off0000f770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F82 18188 bytes
SHA-256: d86d7b47250f3c2967147b55a71b15c245f6e3638b38c4c847495ef2d3a55903