Malicious PDF — malware analysis report

Static analysis result for SHA-256 785be08e47bf9cf3…

MALICIOUS

PDF

70.6 KB Created: 2021-10-01 09:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 020ef29a7a2e4e6d0d919c5ee6f8c59b SHA-1: 697d40458b9fb20eae9f19a5ee115692ca5a7f0c SHA-256: 785be08e47bf9cf3bfb81dca51ada3dca4a7b408c468aea0367e6f3616ca3c12
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various domains, some of which are hosted on compromised WordPress upload storage or disposable hosting. These links likely lead to the download of further malicious payloads, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=harry+potter+and+the+order+of+the+phoenix+pc+download PDF link annotation
    • https://duproject.com/uploadEditor/files/luvalirotawedozegof.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/73070010307.pdfIn PDF document text
    • https://invision.buzyhub.com/files/nukakikilumurewevizos.pdfIn PDF document text
    • http://mlead.net/images/e/file/rolofanat.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/14393129559.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/waledolibarozixotifipiti.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161566c0f3c9d3---nasekedimubujosi.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/kutadus.pdfIn PDF document text
    • http://kyea.org/imageuploads/81777604751.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/molelubu.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/foxevofisokobexoselata.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210929085349_pwd3jh.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/komegudadomakuzem.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/tudufokagekodavezuvor.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/7fe0b53ab1356c972e422a515b064cc4/95815258927.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/nasuzemeletifodubegega.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a8a877fc---32333298164.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/ceb2e01e03e3a0c01775848624fc3d49/lirofixutexamigivobej.pdfIn PDF document text
    • http://c-amc.com/upload/files/fizisogexawifogorufilew.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/50267213382.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153be9f3cd46---65713589786.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/32961300404.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/41821847713.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_off0000b095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB095 16776 bytes
SHA-256: b77bc38d54a1c02c494d77812f6c35439ab8bdb70dabd78eb156dd2c7e2aa0f2
font_01_sfnt_off0000dbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCD 10840 bytes
SHA-256: 2d9b932c383041f2f33ce0971d7bc12c734a2f0932e94a32b6d13b2e0fc60f3d
font_02_sfnt_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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