Malicious PDF — malware analysis report

Static analysis result for SHA-256 762de75f1c32d1e2…

MALICIOUS

PDF

73.4 KB Created: 2021-09-13 15:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2bf3fa59beeb3d4c6ad143d426033e67 SHA-1: adc7857173806b9c1fc95586d752e0d179936311 SHA-256: 762de75f1c32d1e2bbd91fb9c2fd26a0fb1a811049ee6548c98e924b5da5c1ba
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting or compromised CMS upload directories. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial gateway scanning. The embedded JavaScript is likely used to facilitate the download or redirection to this archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://biurod9.pl/public/userfiles/file/jaxofuronevojevitimu.pdf In PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161341a3d096bd---99890017080.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jijovosuledub.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/vufaburikibusukisara.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/79729673914.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/kimanozemedi.pdfIn PDF document text
    • http://myredm.ru/uploads/file/71982204187.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/fakarikivininosesagamuf.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/16eb314ba4fa459f3c1287be13131971/21373119745.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/4496021213.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210831212835801751w2f6f.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/86137347639.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/taxetaxigazixavugerik.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/16877321348.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fodumisixaxi.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/kujebuwi.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/mikag.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161304cc2e0f12---pukiwexopiw.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/gosajagifarirexi.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/belajovugapiwezilukarata.pdfIn PDF document text
    • https://premium-house.uz/images/file/japirig.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/51318815757.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/3502276551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=kgb+archiver+apkPDF 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_off0000be2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD640 16248 bytes
SHA-256: fc190802fe9e4e441fc621dab8016aab5a28695c08c98161abc268d76a077055
font_02_sfnt_off00010073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10073 10408 bytes
SHA-256: d9f9152f5180672c635db6d69ddce1685c3a183e7b48074ca0691ca4de152be5

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