Malicious PDF — malware analysis report

Static analysis result for SHA-256 24bc2d64e1704d87…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 04:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ca44681ae4d380ab8176f2895b7b438 SHA-1: cccdcc00facd0542ef884d2f3b1916fd5f686358 SHA-256: 24bc2d64e1704d87a5ce1c7b7db9f473113da84c6c3b32a394ba661c78833ca3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is often used to execute malicious actions. It also features a link farm pointing to multiple distinct hosts, some of which are hosted on compromised CMS uploads. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded JavaScript and link farm suggest an intent to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.eos.org.eg/ckfinder/userfiles/files/fefiziridivel.pdf In PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/mclbd7332ei3ngj5e2fdtvgs41/69786550076.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/rowolamurakopated.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/45e71048b6fcc1e6073fcb52535457c8/lorafuzotugoluzivapekuw.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609acede6772b---ponedafozipojurevudu.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/15930659589.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7bae7958b---13587294007.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/kusatenupuduba.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/32663891372.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/kugedonuguzamolekowum.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/mibakonor.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/wekujegogufavilevumoboguz.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/38315688443.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/16222600452.pdfIn PDF document text
    • http://omg50yrs.com/clients/6/6d/6dc66c997efb3e4e8ce6e6e7d0694e91/File/35757779744.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160808d044a911---87103957896.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/61753648292.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a001c7ae4e5---palebelamujikef.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608634a48eb85---63752732381.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/tezitomevudekaxonosune.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/baxafegiwulupexiloza.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a102022e83324cc7b72682da2f78b626/14106778590.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/c1j3mulvnujc2nik81ip2q4p41/gaxokezemilutafitup.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/gowodiretokiradu.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/42208343399.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/pakabujisemenowede.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893453565f0---rulipebinulexarotoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pneumatic+system+calculations+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_off0000d668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD668 15780 bytes
SHA-256: d3d27def0b119ef25e65f2313cdbd1d57ad9d77576eb37f4cbd8cafc549603e6
font_01_sfnt_off0000fee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FF 10896 bytes
SHA-256: 83d307c1468b9b42b77e416ea74150081f61c804ab22f06fed497fcd96192cd5

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