Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7f6bdce021c1c3…

MALICIOUS

PDF

80.5 KB Created: 2021-08-18 04:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3008a04f7cfac8655af49f5933ba7c58 SHA-1: 24779da5248b5bdd27cc943dc2f3684cd848ff90 SHA-256: 6d7f6bdce021c1c38c2e8235349ffd87527eb410ccf43388b99a8837c38fd3c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to create a non-clustered link farm on potentially untrusted hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.awakohchang.com/image/upload/File/itawakadazilumoluvewej.pdf In PDF document text
    • http://oresteruggiero.com/userfiles/files/12666520615.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/08c93f6f6417ce9df1a2cb95fbf34a1a/20112415557.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/karixunoduk.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7585e4966b99bdd7f3704ceca9c376da/27647711141.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/50391248940.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/kufavuxekofapedojuzosun.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e1834c33d---94185287795.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/vamubiderovugavofes.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a087090e487---pokubovipewigezed.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/noxugemotazelewex.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/modipaxanajapajati.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/4300f9395d8e3c22f4b37e1f0c66ab72/vakulapunakunalawirinom.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/20001609418.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/45929270592.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/78664914754.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/qjv0cih49rg4l5bnepa8bh6boi/48001884598.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/xexokopajivazufid.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/60946350701.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/gunitebejeserupagak.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c139c69e3---dimatabufuxikav.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles//files/jeviz.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/topebonavegom.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/7b979b382a0acdc4ec4af60412a3f1e0/ramumepanugidiwitavikepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+the+best+app+to+download+kdramaPDF 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_off0000d79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79C 16800 bytes
SHA-256: 7ee4c91e73a8df762b76cf2297720ba24ac246f959563a4a52c76b4a6b51aad5
font_01_sfnt_off00010336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10336 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4D 10968 bytes
SHA-256: 9150eee56b2682e340e880dd7797eb92d9246f9b8ef9bcd1ac3d1ce6cf41dd32