Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a2ada0287c2a09…

MALICIOUS

PDF

94.1 KB Created: 2021-09-18 13:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dd3ee229d4cdd10c39f61f1d4f47d764 SHA-1: cd335ab9d74e8b24af000cd367d2111bc0fef8d5 SHA-256: a0a2ada0287c2a0930bec0c59ba14744884f09c9aedf2cc66d7093b37760b868
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to disposable hosting and compromised WordPress sites, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics confirms this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ctners.com/ckfinder/userfiles/files/rivuxarewebutirut.pdf In PDF document text
    • http://bisenzia.it/userfiles/files/9144173500.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/sabitidefubozuwafuropas.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/ferumudinapabopu.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/19700088756.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/luxazasema.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/jevazomu.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/rakilanezujuxo.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/cb15aaa4d999853d22aa02771894d89d/23866808538.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/82606007687.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/nosepasitesuwugo.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/36567240706.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/poborogedasa.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/zuxufojexow.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/gareridowiximuxezi.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/fc2bfec1ee0e19ac258ce26eade8f49e/xoliwuzasevajerokupafeza.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/op8b8u9dmsab029lmvsef7lfce/nivexuzur.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/6528368441.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/46934724940.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/60385594587.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/62909408097.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/096315fd9967ac166bff988f3c4cef0d/suwibejagoditusafiseg.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161330550c7012---11070132559.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/ribukeroxuwubobi.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/37016208334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=emulador+de+android+para+pc+sin+internetPDF 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_off00010681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 10756 bytes
SHA-256: 9437c6393a11f46e83d1903110a9b430fb1118fb25ae62918a05df7af4291a9b
font_01_sfnt_off00011f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001373d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373D 19336 bytes
SHA-256: bd457c2169fad083693f4a608b46e78019ae9df1b8b870270a799fd63d23aa10