Malicious PDF — malware analysis report

Static analysis result for SHA-256 de448b973fe6398d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 12:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 638b9a326a292f664db6714a27ac9425 SHA-1: 9bd3d2739e534a822a85837d17ba56838a52ca22 SHA-256: de448b973fe6398d40f28301223c52dc441ef353bf99133cdd7d79d4f06ac4e8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/20520816405.pdf In PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/94057829855.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/36798618446.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/xogedijolawokuferikul.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/7537100738.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/58962407633.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e575d2e9e1b11f1da094e0092fc78d00/64011380526.pdfIn PDF document text
    • http://atya.eu/files/file/pefowineja.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/guwebavivet.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/14441685697.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/zosebarukupasojozuv.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/54324065208.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/79879754671.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/ganobubopejisujejadekil.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/37443585359.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/gularazax.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/27526935078.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4c56de13b74af736a4cd21c8862fda8e/sagidajanuxe.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4df7d7c55983befb3b2718075a174e4b/kakapiwefilazije.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6da78bdd4---jafokegolefaxejapimuwum.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/pumobenagomasogalivor.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/87674406658.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d5815c9ac---26044167226.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/98588941409.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/feterexoletapazoviwewogex.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134e30933c00---setel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ppsspp+cool+gamesPDF 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_off0000dc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC62 10324 bytes
SHA-256: caa054d584bc5e8d9f0c78e693a44aad695af90aad9b7898c9a561e4a2783e9d
font_01_sfnt_off0000f3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BE 17220 bytes
SHA-256: 602575c57768b0e355bf28b374c797d6e05cd364d3198649afa7a55e57fb5184
font_02_sfnt_off00012048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1