Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbc76e700efa53e…

MALICIOUS

PDF

78.4 KB Created: 2021-09-11 03:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5683cfecf8bbbb2b93821845ca56c1ba SHA-1: cccd7c36cca5619fa26a78a3f478cf02310201e4 SHA-256: 5fbc76e700efa53e88f0eb9328aba335c1b7c73c06495790f61dbbfe76609f12
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1555 Credentials from Password Stores

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The 'SE_MFA_LURE' heuristic indicates it's designed to harvest credentials by requesting one-time codes or MFA confirmations. Multiple heuristics point to the document hosting links on compromised WordPress sites and potentially disposable hosting, suggesting a phishing infrastructure. No scripts were extracted, but the presence of embedded URLs and the nature of the lure strongly suggest an attempt to steal user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613983f136bae---58761864266.pdf In PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/84487607112.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/vevukexadukewapowaniv.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301e2f66804---39922415291.pdfIn PDF document text
    • http://winso.tw/userfiles/file/4838220549.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/72211278879.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/gefadusugewaxuxikobajoba.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/vifimes.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210909_201137.pdfPDF link annotation
    • http://honderhotel.com/UploadFiles/FCKeditor/20210904200121.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/kuvabinosibulevidimu.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/16516178686.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/vuzasilibatomevozire.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/mapubuvijepexiwemogolo.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/52096128258.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/41380097741.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/kopusepepatixufog.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/zonimiluwisefu.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/30162539905.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/giwixexile.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/59442354178.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/uj18c273kugihilmp5ljjibtkj/zufevepam.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/fikaxuwifusakas.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/71822640483.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/73095192740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=amazon+prime+video+pro+mod+apk+downloadPDF 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_off0000cddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDC 10572 bytes
SHA-256: df86af5167367e2607a08f98327b5ab974ad4ac67ccb41ebb1181329770c9f4a
font_01_sfnt_off0000e5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0D 17584 bytes
SHA-256: 70f2adebd00358223d61b5ddf2be03dbb8c18614c2b38bb1659a5526585785ab

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