Malicious PDF — malware analysis report

Static analysis result for SHA-256 2261f1bc4a70b69e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 02:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 28f22ea9d7b152551e988f94f88f861c SHA-1: 03344adfbb7d5f530f3b187764d757c0be7e9d28 SHA-256: 2261f1bc4a70b69ea7e0113ccebbf5291eec30cc77effaaff85ccd3629b54a4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=abcd+anybody+can+dance+2+full+movie+with+english+subtitles PDF link annotation
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed913cf5e1---68994489824.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/391332397.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/70570115964.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a9d70c55---wepewopadefamabimo.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/17633729229.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/52749846791.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/kasopojodiregovukozavegu.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/rusexotajezelirenewiz.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/xejibisof.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/nesejirajixo.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/18581585975.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/40855788920.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/fuborubabuwenogudum.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/8nvoond5i2odh4h27r2bcja5pc/9507926556.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/zimilato.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/32115639545.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/tutaliforabobasonakomalof.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/28604645642.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/3631d2bb012b3a4d3e298321faf44e88/letaliwevonewo.pdfIn PDF document text
    • http://104408017.linker.tw/files/gasupa.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/nopabedanexuwisulatiw.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/demojojim.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/dedajuvugin.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_off0000dc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF496 18204 bytes
SHA-256: ab255f703fe4808ef38a3918d6f8c48c22ecb6764633593661f5d69eba3b6b39
font_02_sfnt_off00012363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12363 11428 bytes
SHA-256: 978d41ef85e78d7f49464002529d8ed57070f563c899ae270d3a27f03fc20b6c

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