Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e68517f02980e0…

MALICIOUS

PDF

72.5 KB Created: 2021-09-09 02:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 16655ee05059d53623c535ea4caa25a7 SHA-1: 8033f02c5c64a04750dcbafdc51d9888e81416f0 SHA-256: 82e68517f02980e087c6f76e573ce9157990e16f5d45e600991a5cfd2cd3d4bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to various websites, many of which are hosted on compromised or disposable domains. Heuristics indicate this is a link farm designed to direct users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=mean+words+starting+with+m PDF link annotation
    • http://csim.jp/ckeditor/uploads/files/64744089549.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/74644704515.pdfIn PDF document text
    • http://kyea.org/imageuploads/87048360318.pdfIn PDF document text
    • https://angkalaris.com/contents/files/zozogazenat.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/55335220178.pdfIn PDF document text
    • http://fivelscope.net/fckimages/36319920977.pdfIn PDF document text
    • http://wwsm-us.com/files/file/16906694275.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/75263794100.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/1576099581.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/xejegurulosukofibamipib.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613011ef53b9d---modulazovogatejenemep.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/zofawe.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/zofekowa.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210909073726.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d845855fb725ff47bc7e7ba52307abe1/sopixikuru.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/29853860565.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/73249810185.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/78565997929.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/pelukojezisobefivesefav.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/91826104391.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/rurosijixilu.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/78495160513.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c694ab1d95499769e7fccde530481e55/wupob.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///17543558952.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_off0000b812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB812 17160 bytes
SHA-256: fbd99dfc6767f52ba5f950a06a0ba93defdd508084fbfd2dc360962cdd7c2b0c
font_01_sfnt_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 10728 bytes
SHA-256: 6ab54da87ea285d53ad9a3c31652ce4eeb7c00897306319145e54ae34ab0f1e4
font_02_sfnt_off0000fcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1