Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ddbb5a3c44535b…

MALICIOUS

PDF

91.8 KB Created: 2021-08-07 00:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 25d5e413049168f593cf3c3d69f4e94a SHA-1: 34e935377c0605f1c7b0b28db396380189f97991 SHA-256: 42ddbb5a3c44535b47a87257ac557a2ade0c4a3cf0b9c80d5b1500cbbc87fb61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external URLs embedded within the document, many pointing to compromised CMS uploads or disposable hosting, suggest a phishing or malware distribution scheme. The file's structure and embedded links indicate it serves as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://garglob.ru/uplcv?utm_term=como+cuidar+los+5+sentidos+del+cuerpo+humano+para+ni%C3%B1os PDF link annotation
    • http://tutaylamhet.com/storage/ckfinder/files/mobomokowegilije.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a144a30f723---xagokuvibijif.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/bbd046f50e95ca57bed90248c5ed25d8/27284654112.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/kedojiwo.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/62938175569.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/goramesiwepofuw.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085c0491b01f---28566910974.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16077b64a42b75---33027485962.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ecad05f6a---rilokitikupopizevatu.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b01fa6b2a4e0650286a2ea926bde0d6c/16740469556.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qgun82u58pojk3pvgnvaktntf0/84382537039.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/54586735533.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/ximosewakejizivi.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb71405e7f4---levigilodapokotaso.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/jc15ji30qcscqs6rfvp48c4064/lejolabuwugavororivewug.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/21eada744d051c16ff721a804a17083f/jasogixato.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/45379041346.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/8qi81r4p5ehohnu6se6kbgf1ck/loleropevepetane.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/59923080924.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/57494dac6c01b2acf7390c4abb478423/viwegolu.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c724ded97---8997257696.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/i55bb63bmug1kkfo6p3218qsn8/15523838544.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/xulaxuvipuxu.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_off00010024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 11252 bytes
SHA-256: 323d8ba53eee44039916739c15025072940ce138b828b200ca604acc0d042627
font_01_sfnt_off00011a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A18 17348 bytes
SHA-256: df6e210eb4d6f19e5cf7a6377d983b1584230b7684b082348f0d38dacdc969e4
font_02_sfnt_off0001460b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1460B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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