Malicious PDF — malware analysis report

Static analysis result for SHA-256 133a05efa336ed93…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 11:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30ec808a888d10a3c40bdbc3f8435997 SHA-1: 3efa81588a6bcd8a3d1b605f57f04bb4b04abd65 SHA-256: 133a05efa336ed93838ce2602505b50e7b75a0b2165be9c8a1ca7a0e9c1386ae
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common social-engineering tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential theft or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://www.ville-dammarie.com/ckfinder/userfiles/files/wusijovukebutoro.pdf In PDF document text
    • https://larrialdiak.es/files/galeria/files/nuvujavekinofu.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/33699277205.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161406cc14d2ca---bosupifalesa.pdfIn PDF document text
    • http://gr-chem.com/upload/files/wuwadaxovab.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/milekub.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/suvegu.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/vatepolixuke.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/pifanewifog.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/66964047712.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c110259ec7---40152529392.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/senejokixofalafolodubu.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/berubakilavipu.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/2927cdd2b2e659427b2ab416af03fd3b/nerabenivoviw.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/rajaduxexuketasat.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/73421691417.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/98019945868.pdfIn PDF document text
    • http://livestocktool.com/d/files/pevakipepodil.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/difomufasadepagis.pdfIn PDF document text
    • https://synersys.fr/contenu/file/wizenisi.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/78132908157.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133f951adf64---mamitatuwufekefodaloguk.pdfIn PDF document text
    • https://blokhol.com/upload/files/wavonafikenurapewodawen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=chrome+android+menu+bar+bottomPDF 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_off0000d5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 10568 bytes
SHA-256: 79be6551c13692a760fbc263e86377de828052790a0666d29536a4c6d29f4021
font_02_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 18604 bytes
SHA-256: 439c2e292f2772c8697410b5d95ca99cdda56508faa267ff1866daf2fc1e2c14

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