Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b0bf93d82803f8…

MALICIOUS

PDF

71.6 KB Created: 2021-09-28 06:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fc8daadd786422729223f4ad6ac92461 SHA-1: bb11e955521ee063fd909585b9476c1b95a921ca SHA-256: 68b0bf93d82803f8e69127649b23b17e9b11085e1ca2e6de1dc8ca38082f08fc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. Heuristics and ML classification strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan. The primary attack pattern involves luring users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=max+volume+apk PDF link annotation
    • http://liderzy.natura2000.pl/imgturysta/files/kuzubonowunijemiwiwusu.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/91076854211.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/48361849430.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/81401263284.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/kefisonulixipusede.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/banubavukel.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/kofonisuwatatabokaroku.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/ronerefitexijewu.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/54626528865.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/jigosozufijinegafegu.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/jorisujotazivulapelefeza.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/18580226747.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/rikav.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1223596240613029ac9b4c5.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-20/20210920191230834975.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134cff46de6d---10219745993.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/93606392134.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/vavegewukupubefu.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/zevoki.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161428f3e1587a---88992246826.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/xifapo.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/bexopi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148be5758beb---wutor.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_off0000b2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EE 17660 bytes
SHA-256: 570f4e32a298941962e5b4e0d063dfbef118427f3ad8ce36c9f6e201aa9e64c0
font_01_sfnt_off0000dfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 10204 bytes
SHA-256: d77a9c12ff33e67c7714d66eb3185cb4f2f2fc81fadaafb235f9e215db8f607f