Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2ece87ba066e29…

MALICIOUS

PDF

88.2 KB Created: 2021-07-19 19:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1de87aca8a9071776f189197de67e418 SHA-1: 0d47c470996ecb5753628497b981da514eca545a SHA-256: 6b2ece87ba066e2978cb40241dab37332650df1c8366b95dde49bab7d8a5df9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://daaeportrett.no/upload/file/posodadivoku.pdf In PDF document text
    • https://zlato-eu.cz/upload/files/mofimuliviguzu.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/82094843367.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/66401998208.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/97c61ffa8b4f69c9121439c2f0d4c203/13499069433.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/1820eb9144aacd1695e64ec5bee7bcb9/22320291639.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/23433950514.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/mimokuzogiguziwosu.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/sen4m6dtu2fqduu6cjq29ot4p7/zafaliwakegi.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e87f239975227f7ec3a900c826531d00/29438597318.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/daripuminefum.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/lavawabawa.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b23f0a6836e---midenimufasug.pdfIn PDF document text
    • https://go2germany.ru/files/file/nuzat.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160aa08a6be083---jewesilewobexosomaba.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/duruburilexixavukavegotod.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/d79crujfk42vhhbc1jrfr7op54/18055759741.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/jazesisulakominanogewe.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cee4e1eee---tosowuduvunoxoluzoputafe.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609847b1f1a04---zukifo.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/28911583499.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1b4dba5f1---55246159581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+most+dangerous+game+antagonistPDF 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_off0000f668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7A 17344 bytes
SHA-256: 004ea6fa06a5b33996eca31e145e3c9e85b33cab68a85f85a8d234a2d821fb27
font_02_sfnt_off00013b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B80 10712 bytes
SHA-256: e8f2b155df4ef66b19684035d6c8e47e246ae2fb855b543e4d6fd1e8c57ef3d1

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