Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a73de27550070c…

MALICIOUS

PDF

77.2 KB Created: 2021-07-31 06:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9173b6e5e7fe809c375093f033bd2899 SHA-1: b8990d83aba58abdef86f72f4da954795c5f289d SHA-256: 23a73de27550070c6f5997e44067f8a550787d5347161ecee2e8f258f1c4b6cb
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 document contains numerous external URIs and links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or phish for information. No scripts were extracted, but the presence of numerous external links indicates a strong intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://huntic.ru/uplcv?utm_term=libro+resuelto+desafios+matematicos+tercer+grado PDF link annotation
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/9slv0s9bhm2cc7tsbq5a5dgn4p/tulipepid.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/45797884666.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4b87f37b3---97455321311.pdfIn PDF document text
    • http://allasclub.com/campannas/file/nuredaw.pdfIn PDF document text
    • https://badoza.net/userfiles/file/vuxisubujularosejop.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210712220204181.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0e2891b9---86861922170.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/moxirefurebokileru.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dcbf5ce33a5---5194328933.pdfIn PDF document text
    • http://vtaky.sk/media/file/lojefijibunixaxari.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/djf2jdi0tp683eimle0ngg5li5/80487446339.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/54929695461.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/xinegig.pdfIn PDF document text
    • https://areicon.com/images/file/dijesurobugefowovam.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/8889559243.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/sojegivi.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/munurezuja.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/67334344740.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/gasazujeveju.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc75a52544---76102854097.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/24625872530.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c467dd5e0a5---wugirunegix.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_off0000c8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D0 17064 bytes
SHA-256: e96ca1f792d4c87cbb61db8509e5a523f1506aa41ffb6678c5d41ead6b11dc0b
font_01_sfnt_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 10912 bytes
SHA-256: 32ba45b2727c5e22a6d13657ccdf0810ca0697e65a34a1965efbf0a6709f2eae
font_02_sfnt_off00010d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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