Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4d375021d2d722…

MALICIOUS

PDF

80.9 KB Created: 2021-08-26 04:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb0c95343eabc6430097f468d88582d0 SHA-1: 4d6ac3d1769104a40ed8708ce5a82a773e4b62dc SHA-256: 7f4d375021d2d722c2a05e1228ec87a11d2adaa74e61af06be0ab277d078618d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these external sites, which are used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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 https://thefertilizerequipment.com/d/files/43360340119.pdf In PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f44cda07f45fdc79b2046c4ff87acd66/77008152781.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/13169427619.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/65913438971.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/67994946533.pdfIn PDF document text
    • https://2winit.com/Files/files/japuxesud.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/91414597154.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/fesamazeforumuforuvezubap.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/jovawabit.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e45133c82f---vijivamuk.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/88070928855.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/18978169449.pdfIn PDF document text
    • http://hanleyresources.com/images/28853975494.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/zosema.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/99728873c2268184d752f267d38d1966/94908835615.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/70400902021.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/13588092122.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/42651772403.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794e8876c2a---vuneduxonizukenuv.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/39069128370.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/vudepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=golden+hour+photographyPDF 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_off0000db2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 10664 bytes
SHA-256: 2c003fe29de54c253d7d6b983d9eef05dbeca3de7522b65845f2b629a17a5686
font_02_sfnt_off00010b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B72 16564 bytes
SHA-256: a3d73aeb9f61232dbfcab68f2348fc8d75f20076bcca4125ddc9817060b27fa1

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