Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e5857b8702a180…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 12:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 926d7f62b308ab1aabe6bb2a60091298 SHA-1: d97e02aa812bbd74a13e73c0813cec6d50d58cbf SHA-256: 09e5857b8702a180a5aab64572b350779fa49a1f77b682966adbee6d6e1f698f
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of URLs, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. The primary purpose appears to be directing users to external malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=hernia+diafragmatica+tratamiento+pdf PDF link annotation
    • http://nyitotthaz.hu/userfiles/files/danebaliro.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161103508873cd---varalekuzujodevasexifuj.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1628563923sCrS.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/da76f32c093f82f6ac1979579a45c5b3/zokofobikeloxulukiku.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f7fe0bb3---gubipinevadijagazetuxu.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/77951911506.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/70417123194.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20218419435950.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608874c83eda3---lidasamuja.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/letibe.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/rijubeneweso.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/hapr8vkajfnmnd1m6529ooe485/32145895005.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/fec3abedf5b3467c49e96169685661ef/dolefutapokab.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/47205168565.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/67506395042.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/f42d9e2cafde48d356b767323d21fb83/14087039630.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202107160812251544.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079371ac557b---mufanobekidetados.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/95151789848.pdfIn PDF document text
    • http://stylekd.ru/files/78158643845.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/18764823795.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/66126790787.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/cf1367a216be5dd6b40d592a242154ea/mibuwujoxowavuke.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a4b8c3f89---wabumupavegu.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/d0rqh7a6mkaieko3rfomrs8ir4/63149134776.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_off0000de0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 16204 bytes
SHA-256: f7f373a92e0a03eae638de88ed659a52c1a961d1449d2df3de47ecd358ebaa86
font_02_sfnt_off00011f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F61 10740 bytes
SHA-256: bb6d75c6f6227c0ebf8aa6bf9aa4b03500b7e9af42d94ab57fec0d5183c86ead

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