Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d905d41c49a0ad…

MALICIOUS

PDF

73.3 KB Created: 2021-09-13 20:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: db28915818ec3c0e8ef69f078a2cf3dd SHA-1: 92180da983185dc62eaa23b31295def1bbbc3db2 SHA-256: 28d905d41c49a0ad0c08e91a4558a9280a007bddbfe2a02b3077a50bd6cb06d3
164 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable hosting domains, identified as a link farm. The presence of a 'download button' heuristic suggests a lure to trick users into downloading a payload. ClamAV detection and ML classification confirm the malicious nature of the file, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wangyiphk.com/userfiles/wokitunoda.pdf In PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/davufavimabimejoj.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/74999641016.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/tolupinexemipovolu.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/12850222781.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330d10b8314---xezuwosemalin.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/xibevixijixewanuxoz.pdfIn PDF document text
    • http://gysanya.com/upload/file/2109032342421198914zl9ue9xdxiy.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/90421462053.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131c8b645dda---sanofa.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/gifidasodoxila.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/8641252609.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/woduromalujiwimujifupo.pdfIn PDF document text
    • http://unibox.lv/files/text/92996048958.pdfIn PDF document text
    • http://airmon.hu/images/files/xumomememugutetaleg.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e38a0526bd---83203032670.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/79153692125.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/93080370964.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/53437727253.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/47057987190.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/movakami.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/205493106.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/lodis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=angerofstick5+mod+apkPDF 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_off0000bbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBA 11124 bytes
SHA-256: 8c12e2d37f09e2a0218c77a35571c628cb155d7afa483967fb30fca28fea49e9
font_01_sfnt_off0000d59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAC 16356 bytes
SHA-256: 7074a6fdcfeb86e84bf6260c828576f5cdf576f97e3e3861f2bf4cae0f7d191c

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