Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded851075b54fa5b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-23 12:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 76402e68177775ed4c815b76932a1610 SHA-1: 2331b196c2b324fdcf0adc0eda06bf957e21172d SHA-256: ded851075b54fa5b7990c636d5cb05cedaadcb6dc204f29aa6ebd75075a7f400
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and embedded URLs are indicative of a malicious document designed to lure users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/h9vs18qfgo56tbaod2mcu2adg0/dapidamap.pdf In PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/luzorubejivufexa.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/danile.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/2188449641.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1e8aefcf8---2179409662.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/ruwuzeb.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/takuxoxuzufudorelat.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/pufafexisal.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/tokoxiwiv.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/texeresonepusixegiboromuf.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16134c39a2979b---25023972345.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202108312335486612.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/melijopibot.pdfIn PDF document text
    • https://onecre.com/images/content/files/watenibefugedarebi.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021921162565937.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2bf8e896c---lujesukafiwokobefofese.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/wukizolukunugodapazim.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/balexenagoruliw.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/51084509580.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/36862156395.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/53968304791.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/32422058293.pdfIn PDF document text
    • http://www.siposferenc.hu/html/losedowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cast+mi5+season+1PDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210919/16319840587685.pdfIn PDF document text
    • 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_off0000dbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBC 17392 bytes
SHA-256: 94f961134a9bcdaca5e541d6c39d1feb565876b6d8a09b4908964ce9b89cdd49
font_01_sfnt_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12138 10340 bytes
SHA-256: 5a5b1baa226dae4be7b8166e5badd937ea6dbe5df58f9cb2168b30409b4a47e9

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