Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ac9acaa98abb2b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 06:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 57566c7740c178b269ec590a3c44bb14 SHA-1: 3f6adbb5202e17ede32726a8d318a82d24c94dba SHA-256: 75ac9acaa98abb2b6a158f4a8eba103ae6a76827f5f9ada343bd1074aecd8f0c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and numerous links to external PDF files. Several heuristics indicate that these links are part of a link farm, with some pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://krisoc.ru/uplcv?utm_term=robert+t+kiyosaki+books+pdf+free+download PDF link annotation
    • http://bertrandetgastineaudesigners.com/userfiles/file/losin.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/83768704821.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/pakojulajilegedabuvaf.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/gisodalasow.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/45878121024.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/34d310457c5bd682116198c4a59282dd/duxudavaxelalozepawox.pdfIn PDF document text
    • https://kiptep.ru/file/22760339443.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/3856027539.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109071101179170.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/toziwevefemefadodor.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/vemebelawemilapetulaf.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/24912156132.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/27225276626.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/12231641872.pdfIn PDF document text
    • http://veitali.com/upload/files/37837707015.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/sofobot.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/88628771427.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/77180234361.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141eb783a113---17850341248.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/gaveda.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/8186357991.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/nipuzaxakajafegabuda.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f17ef22e6a---wudukozavivivedase.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/nodotova.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/nidutipeto.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_off0000dd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 18844 bytes
SHA-256: b42f664e80f941be596ee7bb96ffede37d56be50077176e301cb57e72f673d84
font_02_sfnt_off00012543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12543 10968 bytes
SHA-256: 54585bb6d9f8401d77a60f43dc503a1c13005b8c3ea11c7dae143ef5e091a0cb

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