Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9990cc7f61e0aef…

MALICIOUS

PDF

72.0 KB Created: 2021-09-06 05:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 380f97a09d62a751288759a6a9cd7a31 SHA-1: 3e0d826510789d1890018ac00fd52e055a63b470 SHA-256: c9990cc7f61e0aef75dd07bd558a3bf509a4cb656680b282b82668d1967e2daf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure strongly suggest this PDF is part of a phishing campaign or a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.irrv.org/uploads/files/13544724532.pdf In PDF document text
    • http://szwygs.com/upload/55812488840.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/55974918955.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/bupodazom.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d9d499d62---tipaguda.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090331385ea1---8470378713.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/71630920829.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/ojmvlarulq55s82unmh724tbpo/66094771825.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/85569613718.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/30633196153.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210901_EF4103F05B309471.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/tavowuxosolusafobenobadav.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c229ac1a---36089836837.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/xuzoxobumuwi.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/4dcafe536afdd986eb4a2a1b7c36be87/73943514867.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6091e3eb23---bupisivorodoroxas.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/41430190539.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/6tfuifgr2ef463p7tjsf3ag5i7/gejosidojujogivukunevoti.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/rurede.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cd3e2086a---jejipipozexel.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/kitupimedoripufodo.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/83425943460.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612941d8be71b---dizumogulale.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/44650301598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=solar+energy+pdf+nptelPDF 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_off0000ba1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD233 10600 bytes
SHA-256: 7e57bfa7b1e8c4e1d79b76359c9642938d472db70223bc375a5e012b597aa55d
font_02_sfnt_off0000ea5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5C 16056 bytes
SHA-256: 7644c6b1786c2e9d74cba26743be72bbbb747ca08f0fefb8b349f70967ad0afc

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