Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43bd4f6ee847dfa…

MALICIOUS

PDF

80.1 KB Created: 2021-08-29 01:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 50aec21284d3e6d6ec8fb2f218c531a7 SHA-1: f4627cf822875eeca4abd2ab2fb9982e638516ed SHA-256: e43bd4f6ee847dfa40795d82333a74c5de3dd60964eebdf7ba93bb88d48f9aeb
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest a pattern of redirecting users to potentially malicious content hosted on various compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://kimbuunguyen.com/uploads/userfiles/file/ziridewarupibarexetasom.pdf In PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16086c684bb542---15540640976.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/wonokisedopaduregumu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c7de8bc5a36cb110de21e95ba67cd7fe/73194423824.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f67f87877b94c267bcdb663cc1eb85b4/79268925571.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/karakoxigovuterof.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/38825786782.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/kotuxagok.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/jugikimaweke.pdfIn PDF document text
    • https://telenovella-bg.com/files/21988013527.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/49536776820.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/53084183118.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16089050a2acd7---80059031382.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/24395613424.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/lamadumagakunigomala.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dffd7367b5---wufigoj.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b798ec74246---mudeg.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b91227974ba---xepadukozedaji.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d92383a5dc3---betolotumoditosil.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/xadoker.pdfIn PDF document text
    • http://paradoxine.com/upload/files/muwekate.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a704f439d4---70404259965.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/62182131816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=harry+potter+3+hermionePDF 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_off0000d5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A1 17112 bytes
SHA-256: fbba160a859ac67737d0fe05e68076a6330f4a27cbfee0cfbbe6c127fa61d890
font_01_sfnt_off00010190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10190 10580 bytes
SHA-256: 66a7f468e3515f631b6a30601c0a9f23db681f1a63784739f49e6799d8b04e9f
font_02_sfnt_off00011983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1