Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b43e72ebf07c85e…

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 04:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a2c3c6b677157dcdea4e43c42269c584 SHA-1: 4c5b901185e7914d58b586610b1312429d3fffab SHA-256: 7b43e72ebf07c85ef98de39b875436b78978c5f01e27ce570dd37bd9b6f7c15c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

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://crysiq.ru/uplcv?utm_term=redmi+note+7+new+update+download PDF link annotation
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fbfa2bb56---guziromufezunoxujapo.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/56437239658.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613409c4dcee8---48399174385.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/wivaligux.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/87775874500.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/rotanedakujixejet.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/8851424961.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b06c4dcb74---fuxigazatomelusobinojor.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/f5cea7a6fbf7e5155e64c0281df81881/79869407060.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/88035298698.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/juxebuxubexidigeraveve.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/9105320809.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/dipopotukorodafux.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210909124313_s08m52.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/degivaxilexetarowiranak.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137229923c9e---567945106.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/78844757682.pdfIn PDF document text
    • https://ekransamara.ru/files/rumupowage.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/lulokaduvuzodekupetop.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/pks4rua2id8v2ve0hgosbjn9ij/jepogibaloxoxuzemigerose.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/sexivodunenosaxerikoz.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/259d3c5f5b0a2ccf95f5e444514f7576/16884937827.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/2008a9d0a239723458fb97988c0a1aa6/jesidevix.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/wupetarudam.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_off0000de99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE99 18104 bytes
SHA-256: d9cb196a644eb67a8ab734b0ed43cc72cb32eb677012052a49f1af3d4c924d03
font_01_sfnt_off00010d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D83 10568 bytes
SHA-256: c7cca678b98592c34f58a41430fffe4f6e510e97eddb3c6b51be1f0be164c065
font_02_sfnt_off000125b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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