Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea98f91ff422f7f…

MALICIOUS

PDF

93.1 KB Created: 2021-07-24 21:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 10a0c3d94d9d3568efc7658a0fe1d63e SHA-1: a8035c68ddd2433f34bb8819e7163ee0ea9478bf SHA-256: fea98f91ff422f7f19798c25622f9319455e511f72c4683904c0d987fc129e32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute phishing content or malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/f69312c4c8babdd0db05ee6295ade321/zasatalijotuxul.pdf In PDF document text
    • https://torgradio.ru/new/files/file/mopuxivaz.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/79o8s4g1jdifsmhm8b17ka6epp/37957293680.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/wiwiwoxa.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b6ea370d0---fitopomupobibeduvu.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/14813322291.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/2d1bf0c442654b5d3486ab2b90f873b1/lavetudubula.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/paxefokoxiwokoluxusuve.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/zuvubimitudojavilatenad.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/m85lbb441ru0d08bntm90165gq/50379000338.pdfIn PDF document text
    • http://sixtyguildersresearch.com/admin/photos/file/kivunegarodunasisorux.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/56025097405.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/63379439237.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/majamodemuzowelemaj.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/mexesuwav.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0cdc2a9e7---42915740013.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/loxejo.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1ec48cfcdab6e7d0d6f0b7698cdd89ea/60498559724.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/r1g379u3ti9luk33a3rjkkphmh/mubativefebupizij.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210529033144532770252.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7626f177d---bosekuligarorebab.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/rezugizorixavabu.pdfIn PDF document text
    • https://eventaipei.com/upload/files/69641585722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ejercicios+con+palabras+agudas+graves+y+esdrujulas+para+imprimirPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CB 16068 bytes
SHA-256: 6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d
font_02_sfnt_off000118e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E7 18452 bytes
SHA-256: 7fd36deea7878ca8706a8a49edad328640c0b34e7a87b79d48c509d2ed76cd44
font_03_sfnt_off00014832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14832 11292 bytes
SHA-256: 88980e3708d8b489e0f4d8c283f8bac3d140796c9b680d6e8327d23ca8a7efb8

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