Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a286f741b807c98…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 23:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 01fdd3f476b6bbc4119a80d3d0372c4f SHA-1: f67723fe028b84611fa9809de60418bdbb338f44 SHA-256: 9a286f741b807c9851698e1b28aebec7654a2b770cdf09e79adc1bd3501b5a63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to external websites, many of which are hosted on disposable domains or appear to be on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://80tner.netsociality.com/upload/files/17448148400.pdf In PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/2csk7th2h2039iekqbp49nunjv/31146113772.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/dizaboramorimosupobonuw.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/lasorewagene.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/90089816371.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/kibirized.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/lisozaroburevuvataf.pdfIn PDF document text
    • http://sdes.in/uploads/lubederodaxepovobulumibot.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ad8c4d2b1458502eb692375b29224667/fenabutapabogelosuluvobow.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161274437aa11f---46280039593.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/39932684624.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/ccc9569247c68a3ac77637d67fa6ca05/zasiwuvukewaz.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161287d8e8f2c7---52157751660.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/8jeh2chh8tg033kchmiiot19f5/xutafetikatet.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ec4d33538faf4efe086adb358256ac6e/ruvazulax.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728c82deff2---kapujofuj.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/e7b7c8ca11a4e00373d18bb405ff3fa3/fanuxazixedupajotugutuku.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/venenosemujiwabufa.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/volebalixanugapa.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a7a2d304c---tiwelimiwogubibu.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ed616f9eb899736f5e370da470002f40/55473168171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=passive+present+past+simple+exercises+pdfPDF 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_off0000ddcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCD 10832 bytes
SHA-256: fb644c8a8c0a7658a4525b032ca66e4807c43d8004da6d1020c3afa569241353
font_01_sfnt_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 18480 bytes
SHA-256: 2de863a57b9933d7e01bed3997d883de04a5191f4e2807b9e42ef4e4d0b02afa
font_02_sfnt_off000126da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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