Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1c797ff642ff85…

MALICIOUS

PDF

84.9 KB Created: 2021-09-02 11:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1d9886eff94f611e6b8f056b50d89bc8 SHA-1: 5f9667ea3e6194275a46c51c8ffc7b944ab8017f SHA-256: ef1c797ff642ff85682ed4e21e8c9150a79d018a403c3acdcefd0577e96e0784
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crysiq.ru/uplcv?utm_term=causes+of+globalisation PDF link annotation
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/e81b9d178fc4e481e468f6baaa70abba/wetadavebutibej.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/bqihkk7ibvlm9hqjnim4jnjfi4/66168547401.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/58119749871.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/nalamasuva.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/linuridikukumavizameset.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/ruwozoxananokeb.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/xodikamunesavivofegen.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/favasiwanubedivuwafefug.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/fidususek.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/getopezub.pdfIn PDF document text
    • http://orlickachata.cz/files/files/boserameveneborevep.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/74646718ddcae854a6c919b1a04ac08a/53056905463.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094634fcfa53---49944825053.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0038dae097---1684209902.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210515113402_6n7637.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16071365e4c620---ginekef.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/21550961339.pdfIn PDF document text
    • https://eventspicer.com/ckfinder/userfiles/files/momeziwefiza.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160969fa79b77b---rekukapex.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcefeb9852---47029981179.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/bizazonawibo.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff92832414---52958765971.pdfIn PDF document text
    • http://pneusmarene.it/images/file/gabilefaxozemo.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dc2a3def20ed275c587013b316826b2c/vatuv.pdfIn PDF document text
    • http://panteres.com/files/files/dedaj.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/segefesiniven.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/66847365460.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_off0000e6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B3 10560 bytes
SHA-256: 0dd9ba76f075521f4893f1dc3b51b32e2914c2443c4022cfdd83d7e96c678188
font_01_sfnt_off0000feed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEED 17668 bytes
SHA-256: 1baf1bae2c1ee1334121f1f4b7ed783a3dafb42c101cb86d3d3a33919f854ab5
font_02_sfnt_off00012cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1