Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16e52bdc35fffab…

MALICIOUS

PDF

71.1 KB Created: 2021-09-27 02:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 48cd9f351514d8b7e0e87e61d8d9cee2 SHA-1: f517c72db29445db5516c7a8abd690d7d2481b8a SHA-256: a16e52bdc35fffab2a0bad8542ccc4b3f46300b208c5948201441f7926c7187d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://inwebjor.ru/uplcv?utm_term=comet+july+21+2020 PDF link annotation
    • http://zap-interactive.com/uploads/files/vedenura.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/85808599814.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/toxedo.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ddiuaco3imu565tmpqakdtv882/vuzetemagukunufupibuniza.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/44679794459.pdfIn PDF document text
    • https://clubharison.com/userfiles/file/26811309470.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/71094316122.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/kuzesafalivi.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/13823412813.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/7f7adf2d05ab113da36f1d79db3a4d2c/85655611844.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/50469730597.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/9465325246.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142823190451---zipipameketupukunivifufe.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/6130a9d641efaba0386149f0d8daf029/kewaki.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109060826539930.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/butuwavulamobedakima.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/138584469.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161300dfb8c1dd---xomaxemazol.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/14338271844.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/94468906811.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/warejuketenokaget.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba436309be---58481785976.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/36846795450.pdfIn PDF document text
    • https://onlinendttraining.com/files/nagerilexuxufo.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/milenimurozufufezozumamij.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/muwolimixugulu.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_off0000b658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB658 10312 bytes
SHA-256: ec67fbd9d8965422590b969f3a5c825c8fee0fcaf5c739c1303487bab97c14e5
font_01_sfnt_off0000cdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC9 16064 bytes
SHA-256: 331f1ebbeee6230bfdb3f3391bddc5f384fe88b826f9fc5b22950c1cff2da694
font_02_sfnt_off0000f6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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