Malicious PDF — malware analysis report

Static analysis result for SHA-256 d960e29fdd3735ba…

MALICIOUS

PDF

71.7 KB Created: 2021-08-28 08:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 90698a6d364b800306e8b1a3f6eb93ce SHA-1: 2e75b4facdc50e4dbffb60cfa2d966bde4943173 SHA-256: d960e29fdd3735ba5707507cd2fbe54fe099a8f23c2c5720c8b1b3f06ef8fb7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of embedded URLs and the overall structure strongly suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=how+to+get+a+dog+to+stop+barking+at+you PDF link annotation
    • https://ntiverification.com/userfiles/file/ritebozexogisujokowuninam.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818fab06e9a---16038991220.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/logmv3gd3vcco0p33tha0c1m9g/84710736282.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ed068b3d2---tozazagalusefasubogokeva.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/gerirosafazefat.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a953a7de301---vapenogujuzeze.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090e58c4209f---fofibivibuvivi.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16110c1bc126dc---dibejesame.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/kisival.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/61520559901.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/588810ebaa572a00f16487d3dffd3230/finotipukusadunerasoz.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/gijareronapoviziwaritewus.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1ac95fc37---26398014533.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/33f40f6a0f4599905502541f334b9156/3244885926.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088bb911ea63---48474987298.pdfIn PDF document text
    • http://allasclub.com/campannas/file/19126460250.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h1r14t2aou14s42jtre56d2as1/28936119783.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/56237863511.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/fekudogasivujosemoka.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/23134357336.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/rvjivooko2tkngctrob278fjm7/volozekozubufeven.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e825a0d0425---54673468734.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/d8n3rqr5den5hu2f95u82f9nso/13609404265.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_off0000b9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CB 14992 bytes
SHA-256: 1c86a6bfbc3bb2a5e58faa25c51ccd414fb68decf5f913f255c555ddf8c604a9
font_01_sfnt_off0000dfe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE4 11044 bytes
SHA-256: e460c25225e3d13da23c4a1a341dd68709c1f45ed68a75f89faaa13fc7c618f1
font_02_sfnt_off0000f95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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