Malicious PDF — malware analysis report

Static analysis result for SHA-256 7530d20c7b684d45…

MALICIOUS

PDF

88.4 KB Created: 2021-09-10 01:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 198b2f4f96a6deaacb5b00ebe95aa5e8 SHA-1: 635e7872b0a4b14fc9ad53f8dba3613f181818da SHA-256: 7530d20c7b684d457a92badd900bea835a07ff15c593a46f547802e9f3092517
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host phishing content or further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=how+to+unlock+your+sim+on+iphone PDF link annotation
    • https://rsebolivia.org/userfiles/file/sisukenojikuzujotixeriseg.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/48946225419.pdfIn PDF document text
    • http://xsteelstock.com/d/files/84803740514.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/74064859023.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/s3s3nk418fm4d71c1pij1lqd32/zituvatufalazobipo.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/pipuwefozufovibigifa.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/67873438777.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/a687ul0hv4d7ohs3t9h1bfksnk/21767519495.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/refewefolalujabisagemipaf.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/21863735611.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210910071020.pdfIn PDF document text
    • http://specimport.by/files/files/gatefijatatebowujiz.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/8779056246.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/30087781278.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210906_B19EED88D3F82CCC.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/zujowaxixojasejafixux.pdfIn PDF document text
    • https://tigapilar.com/upload/files/mexupuwapijon.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/82496604934.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/87214410774.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/36914051513.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/cg7uqok9pjh4ib8ldkr8ropuv1/38085842463.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/23302023807.pdfIn PDF document text
    • https://serka.com/serka/upload/files/67052753983.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/56306256009.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/28240350349.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/2432888102.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109031726405722.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_off0000f240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF240 18520 bytes
SHA-256: 4582607685ed5c56671a14af3c7ea0568691cbf550a99dcc7edeb8daf7141252
font_01_sfnt_off000122a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A3 10860 bytes
SHA-256: 77a629ad7a2bf2eb259bad4795fe1ac5ea329ef40de8ee2cbabe87f487fbb53f
font_02_sfnt_off00013b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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