Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0843058cbb46b03…

MALICIOUS

PDF

105.4 KB Created: 2021-06-26 09:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8d9120879c88095d0e4bfd0bbf83bda1 SHA-1: 8a5b3660d21920262f3d1890673dc14b7b54ba0b SHA-256: f0843058cbb46b032672b53ac76f8f271fed5558ff0622cb15f689bcc9d251c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is unreadable, but the heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0dbcaaadf---kelekulofenabukil.pdf In PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094793c1c175---48793267090.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/c9cf8e507114488969c42e63a27dd3d6/56651954922.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607353c0c88cb---28806549030.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/gitujivuxizukumususil.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/fopatiwujukegogu.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/4f4cd3102bb95803aeea31a66c918d4a/totib.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/70393638889.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/60921429348.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/wedilaxarajoliz.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/30d9d79de1dbcdb304738a87537efd10/49672087115.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/larivivonalijudejoru.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/0d5aa79de6e61fbb0fda2216cc03afa0/dimuwijari.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4a0b4fd977e20c0863ac3ebecdd5b2f0/59634872253.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/werovunaga.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/65930134948.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/otmflpjgal8j4g1lgi9igktm99/waxisutefozuw.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/50485614381.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/1ouotj0rug0ve2hghrs6h5atnl/3964414011.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70f4bb8b64---48503025932.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/55324560342.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/2588119929.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6c82dba3dc6510aa1c41722c11c0f7b6/vepejimudovikinuxoro.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/s0pme4qed3nt5nit6jpq4tlvv5/raganosoxagejeta.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/6addebc61acdcb892d81118a8cf3cda9/83158653495.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607079f9602fe---37672040268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=confucianism+as+a+philosophyPDF 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_off000139ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AD 17872 bytes
SHA-256: 5fa823a12bb0ed16d8c9b5f7fb3a49fd0e2ba02adbb9314cffd3b715e5520bec
font_01_sfnt_off000167d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FE9 10660 bytes
SHA-256: 431db5746b61aeb0b9b25720a87653b9e1bda77989573aa336ca6af5c835b30e

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