Malicious PDF — malware analysis report

Static analysis result for SHA-256 843edf297ff775e6…

MALICIOUS

PDF

86.3 KB Created: 2021-07-01 18:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: da079d8ee9c98c29df7757878dd3660b SHA-1: 5c24a2d359d22ef826c27c05b22bac5b6374b6f6 SHA-256: 843edf297ff775e6fe28162d72c5ac4be1d5e572aa86c70fcacd37002f7518ee
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://chcial.ru/uplcv?utm_term=adjectives+word+list+pdf PDF link annotation
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/3a9a9f8eb4a696f4002e5a33dcc51992/keguzamupiwebi.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e4670dfcd527f3a6067e75ec29bdc1c2/63532237800.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c4acce5ee6b---borewubajozadome.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/20990672702d65bd8cdb7a6806b0edd8/fosaxowomobiminutu.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/8403260577.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/4e054057738fb7f4a730982529f9b46d/dexujigaranizejukujisumes.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/45u9c0ai6drpfvn3f9nse1cfva/15141892252.pdfIn PDF document text
    • https://hoalavender.net/upload/files/56333570249.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608467c18c2ab---53667504050.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072196d099dc---gotajedawob.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/kenibuzunalu.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609be1c4484c3---kemikezitulajanaxekesid.pdfIn PDF document text
    • https://masukpt1.com/contents//files/nefonalipokaxime.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/sazes.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec8ea60db0---xatowuwarupulazutefuwuza.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/vabamala.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34cfb3e8e5---belepajese.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/96722349674.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b894665950d---jafasulapekuj.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/wegovefirerimizemuguxixik.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/33088587731.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/98144406380.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f17658fbc---38738845226.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609972a69edd0---subadaze.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/bagepegugolaxelowojod.pdfIn PDF document text
    • https://cristalensi.com/public/File/lotenavesofidiviti.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_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 10608 bytes
SHA-256: bcb2f10ff112b7c295f13bd2121b103e4c338102cd20f7989f9ef7f38d9954cc
font_01_sfnt_off0001084c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084C 16956 bytes
SHA-256: f2920249725c51dea8e0d671a4a4faa77eeda5d78f0aa6d7b46dd6db6b4528e4
font_02_sfnt_off000133e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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