Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f44fdbe3265026…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 18:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 151002566778be29a57cedfb81b65a3f SHA-1: dba8ac523d9d8d6a8a288b156945789ee26df14f SHA-256: b0f44fdbe3265026f9852b796b6907fc1546dd9c3e3c831d4ec05495788a6418
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, potentially to bypass security measures or for SEO manipulation leading to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crewmak.ru/uplcv?utm_term=dakshina+kali+mantra+in+bengali+pdf PDF link annotation
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b1b06bf6025e030d946a9cb3928c1438/14863909851.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915b699cb27---19906763957.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/87611402852.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e3227e7d12539ffe7e2f1c97175bf445/garewozadokoxonuwiduboza.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/93691925246.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877a3469cd7---11168794138.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0402b85efc---nipokolawoguxuzufizarap.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/6e99e0b235a6071be3a4255b9c479a52/12382366248.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/43102957dc53e17a716ed4cab99bd79e/roxowidamijuvusezeba.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/fapedi.pdfIn PDF document text
    • http://fotossc.pl/_files/file/71509592836.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/xodita.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/nurejoratezupiropus.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160760d91f251d---68462684119.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/61226559818.pdfIn PDF document text
    • http://xycrusher.com/d/files/wetera.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/76029051254.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/23507340678.pdfIn PDF document text
    • http://geotersrl.it/file/wiserazovoxutitumajopa.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/56304250202.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/1072177741.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_off0000d28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA2 11056 bytes
SHA-256: 080a16f948aba3a50076a518317a47f7f4de1e88ff29a307b95169b1bbdae724
font_02_sfnt_off000103c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C0 20668 bytes
SHA-256: d9d4843d0d7f11b7295560441b662c255dc3c335f109b8c6b7205b1366daa045

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