Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f74ecb77adbf9ea…

MALICIOUS

PDF

71.9 KB Created: 2021-09-16 16:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 273d1614a06872c25e08833259ebeec9 SHA-1: 58718a2dbbacb4a8cacc67a5fb81c1fdb7865c06 SHA-256: 3f74ecb77adbf9ea51f18ecd7cfa72bf856e45247af3c02daad0e78f86a73106
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://archism.ru/uplcv?utm_term=how+to+transfer+contacts+from+iphone+to+another+android+phone PDF link annotation
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/cbb11ac72894eff9687eaa1e2b17c989/wolel.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/ximerapegadu.pdfIn PDF document text
    • https://italvaping.com/file/rofubipatarovese.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/74487818158.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/nogezil.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/begifolizisevunofuveso.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/bapugepofuvebifek.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/87669570573.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/bixovodalawikutawemesivo.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/22673817413.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/jixeregidada.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135fcd19b242---zipikikixo.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/40428745840.pdfIn PDF document text
    • https://preciseenergygroup.com/media/ruzuvexamigepawe.pdfIn PDF document text
    • http://forti.in/userfiles/file/16693426181.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/91601605770.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/49128551272.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/15453770147.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16137bd06c4db4---dojupapibezaw.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/tagozixojewede.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/tazowutapigodiwe.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/73613260754.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/98623553844.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/52660140330.pdfIn PDF document text
    • http://thongthien.vn/upload/files/jolafemuteluris.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/71813916079.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_off0000b96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96E 15208 bytes
SHA-256: d33c4bf84c37bd60e01fee84105958f1bc8fae351d667fba5654ef13b45689f4
font_01_sfnt_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 10916 bytes
SHA-256: f646cd80a9aa6147ea2175a768cf073d645531557336f5cc2245ad17b1a016e4
font_02_sfnt_off0000f8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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