Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b4ea0b4e50ea51…

MALICIOUS

PDF

87.8 KB Created: 2021-09-05 07:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26433d772b51441ace487858b0fee788 SHA-1: 875cda32796877051cedd1851a7e638aff8c90d2 SHA-256: b9b4ea0b4e50ea518076fb0ccbded266b7d137882c0740ea3db5f22425eef5a3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, several of which are hosted on WordPress installations and utilize form plugins for file uploads. The primary purpose appears to be to lure users to these compromised sites, likely to download further malicious payloads or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/movbs7mpjaekgf457epnk4cng4/zeziriduf.pdf In PDF document text
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/2080371238.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/jurepazorolasodanuxorof.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/2c203cc8f1d9a4cb2ce75f2c85cad24d/doxuzazudam.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160e34883efcc1---18954458985.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/41899060490.pdfIn PDF document text
    • http://chinahongji.com/d/files/61147815418.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/d07be62abb0edde1e608bfc3da861e72/74975322517.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b5bf9d31f---zuvezujusibudoto.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/10396597691.pdfIn PDF document text
    • https://ka-base.no/images_content/file/wituvawaga.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d7f5726ef6e942f2ac2e98d4bf931d66/71774622213.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d040ef4038---bexiluloxazofeluwapebis.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d672b3eeba3---63914030112.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/98935425885.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/em054rc7sfvu5so5d0s9rvrpu6/67901544952.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/77015888234.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079eaf3b467c---lujav.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/waxukemovedejafosun.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/6717256758.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/favanusa.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/jilutubenuvobositefozobuk.pdfIn PDF document text
    • https://agermag.ro/mm/file/26821526545.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/23134876348.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/vimiwazarakizin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=reflexive+pronoun+worksheet+for+grade+8PDF 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_off0000eb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 18908 bytes
SHA-256: 3aa6288757acb6a2b5658bfa0b1778e477bedaa5daa1af19d3e5da8bb52c73f9
font_01_sfnt_off00011c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C58 11476 bytes
SHA-256: c57c931842c4fe6de15d6672d600cc2d6ced17044383b5d9f04f0b8e23594791
font_02_sfnt_off00013752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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