Malicious PDF — malware analysis report

Static analysis result for SHA-256 758dbf362d473c14…

MALICIOUS

PDF

91.7 KB Created: 2021-09-01 09:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f3c679b29bb8b818a19354d368dc941e SHA-1: 8c76bc19d5485f916829acdc1384194baf91db81 SHA-256: 758dbf362d473c14aa42eda9fd927e3a0e21de70d80b41d02fc5362af6419cdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns align with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/46c3e8402c05b38e86079eda77edee46/zinibi.pdf In PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106270855353957.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/xofukeku.pdfIn PDF document text
    • http://ashioke.com/images/library/File/fedelozenolazateke.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/48345077660.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/bde983122affa9ab2ca2c69bf1c6f06f/lobinaniv.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/58600987216.pdfIn PDF document text
    • http://zae.me/datafiles/file/vejodidasexetuziw.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082df26ad431---1450695604.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160af4faf1c71a---45957572404.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e14219b9762---tadipatekuxemanitodoroxog.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/rifovusivisebafe.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210504094618816302183.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/nelop.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2e75709c5---tisotigevirovig.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/nofomedudisokuzogoleman.pdfIn PDF document text
    • http://519pf.com/userfiles/files/68508161753.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/wugeraridegoto.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/74497497135.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/25047561273.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c9b390c94---88993496696.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/xoturonofufubebu.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/juvikatune.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/40833434287.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/63388055287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=prayers+against+the+powers+of+darkness+pdfPDF 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_off0000fdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 18708 bytes
SHA-256: 35f2564eb0321342c7c754ce99c57b27bf774a54da48da6ac14dd35e80dc76a3
font_01_sfnt_off00012f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5D 11024 bytes
SHA-256: 5800d15c970d0fbbac9bec6b9bc72b77c378f885ef9874b78efa74a6e40f2ecb
font_02_sfnt_off000148d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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