Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5dec11de102ce9…

MALICIOUS

PDF

88.0 KB Created: 2021-09-07 01:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 64f09024fe7d78f8a91477e7cde0e6ac SHA-1: ba2df78d19630c6b5c4cd7a8692607b7b34da391 SHA-256: ef5dec11de102ce917ef9ab8e9fb315a58bd4d4c56f3b0048b4e6b05d7848b68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The numerous external URLs, including those hosted on compromised CMS uploads and disposable hosting, suggest a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=angles+formed+by+parallel+lines+worksheet+answers+milliken+publishing+company PDF link annotation
    • https://www.gico.ge/ckfinder/userfiles/files/10507081963.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/2183753955.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/99741711512.pdfIn PDF document text
    • http://tipiland.net/upload/file/dawajanazebixokogulag.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/65950049435.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809647abcc3---49283913963.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/gikakatadosowe.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/vunomobonulaname.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/jofewogowotodekivotixodoj.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/95074728561.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/48746817218.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d568a6b9e712304e4d7d8900320d35b/kixidowibo.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/gilotilere.pdfIn PDF document text
    • http://twtime.com/uploads//files/202107311155514336.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/grcne5urrpesi0rj4k7jlrae4v/fegetejoxogibomupaxugov.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082017618ab0---beduzis.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160831d1974b77---rinodemujajaduxewuda.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/nokikutidasofegijisowex.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/77543305877.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/34165620517.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f96b308b9d8f1a12c0d27a1844faea2/fejeragojinalimet.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2272cdf15f---25535268817.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_off0000f337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 16944 bytes
SHA-256: 4c53a27f439a7551a87cb312ac251d91e2b5969998f378942c8c917927534e4c
font_01_sfnt_off00011f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 11580 bytes
SHA-256: 7bba6d239ea7ae8e97825719c4567015a106758ef890b4ea173ee326b7f9d854
font_02_sfnt_off00013a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.