Malicious PDF — malware analysis report

Static analysis result for SHA-256 54929dba13d1b932…

MALICIOUS

PDF

87.2 KB Created: 2021-08-12 00:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bf571902acd12a73cdc35e647856dace SHA-1: d57f2c5f4ce58266060b812f761d5464ad7c2d5b SHA-256: 54929dba13d1b932896ab0a34fb82538c5c7db66877f2814b4d8d1f0a22df289
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://queure.ru/uplcv?utm_term=what+is+the+universal+remote+code+for+toshiba+tv PDF link annotation
    • http://haiphongcontest.com/images/files/dofojowofamul.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e43e5ce10---24650026682.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2eb4102e10---vosoxufekemigowitone.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/werasedawezuvuwizifoji.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/l2hrh9oeatob8p8j4mf9j6gcno/fetimekofidadabaribetol.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834d50220b3---gomarodegobuwula.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/35672731105.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e68cdbc963b---jevekutewajowurujivefum.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160afe71b4886e---89765436453.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210605005903.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/7883077df888eed00ba1751d1c6d2922/83549777103.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/ziwatidatunimupiniri.pdfIn PDF document text
    • http://wernitznigg.at/files/67437949663.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b391cead48a---15555113054.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/86398601486.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/jopugewimanunulubowuza.pdfIn PDF document text
    • https://aromamarketing.md/img/files/14471663076.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/84225662602.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/deviwuferogipotulurez.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091d2bfb977d---82325797202.pdfIn PDF document text
    • http://uci.ir/userfiles/file/jororufagij.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/tuputc97rdnjucera3fsgcjldb/dabuwivab.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/29345d9165ef2744f9d444e77a6039b6/bizowifez.pdfIn PDF document text
    • http://www.fotolIn 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_off0000f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07E 16772 bytes
SHA-256: d62e4e8af0c1b4305455ac950c473111c3bddc4475194b3d0db02449c7072498
font_01_sfnt_off00011c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001342a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342A 11040 bytes
SHA-256: e9bf408e4870784e09e77bb4e704a9219e6c8bdca6a6966cdeab7dee36995d7f