Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b403ad5a4e73f59…

MALICIOUS

PDF

67.9 KB Created: 2021-09-16 06:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ef322e9a9164e514f7a50939d775868e SHA-1: 0a2e1635e361da8a3d76927ac27ed76667f805c6 SHA-256: 2b403ad5a4e73f59306ad6e9369605b213493f7108fa07ca81790676cf451f03
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to download and execute further malicious payloads. The numerous external URLs, many pointing to compromised websites or disposable hosting, suggest a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=download+zip+reader+for+android PDF link annotation
    • https://systematix.pl/userfiles/file/jebudininumulurejubusukot.pdfIn PDF document text
    • https://tuinvandecruys.be/file/75868443974.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429d9820034---48394932397.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/72695479048.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/wawasuwug.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/sekupaduvamalewaxaluwofi.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/kuladiloxipedonirevo.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/xopav.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/6322583051.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/12005005559.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0bdlc677vu5rr8rrq3vbk7vbf5/86821852187.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/85673177224.pdfIn PDF document text
    • http://grabnerestriche.at/guwaz.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/83075187404.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/18173756119.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/38452181365.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/lewaruzev.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/rofipuzixewexo.pdfIn PDF document text
    • https://dyaa.club/uploads/file/75109846202.pdfIn PDF document text
    • http://swhos.com/upload/files/tizudam.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/13a74d5f90459fda0f664d5a5ad5d894/zolagedalakoluxunezijepen.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/moliveme.pdfIn PDF document text
    • http://js-space.de/userfiles/file/zoxazemirukisa.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_off0000ae0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0B 14724 bytes
SHA-256: 8d03701d1c73440daad4118ac17649199372af2f8c74442a7072351b32c84487
font_01_sfnt_off0000d238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD238 10372 bytes
SHA-256: 24fcf458fa0fdf7b3af94e75effa7b5b18d2703c0c7e3f84896076a9d87b3a71
font_02_sfnt_off0000e9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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