Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dedb1cc89ca1e41…

MALICIOUS

PDF

77.6 KB Created: 2021-09-19 06:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 68ea1fe83127985a657194b3750d04e3 SHA-1: 1ba9022d0db16640d3ff95a7347d6f837632182e SHA-256: 3dedb1cc89ca1e4123aa1f977e3bb3235ce4b3507d899629eca7ce1cc32e2614
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs and links to compromised WordPress uploads, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=how+to+download+beetv+on+firestick PDF link annotation
    • http://www.findvoters.com/userfiles/file/jexutukukikonuxupab.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/4542264379.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3a0e249b72d51dfb015d9473dba23b90/76301865565.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/41078602417.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/zaxagabatigeputinura.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/90367822905.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161403485805d7---13054868246.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/67699323351.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/24660475012.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/nonebozef.pdfIn PDF document text
    • http://wwstationery.com/files/file/suzotuturaxunosaxadepotar.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/60310309496.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/35132773545.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/bitisef.pdfIn PDF document text
    • http://jsdarvin.com/files/11719359467.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614146ab820c4---femupugebidozedituvilusiz.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/narotusimusuxamefito.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/82886437626.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9533039627.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/78jbrdosl2as8k2osal434flg1/60197992678.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/fpl6vrcu0g9c4juo3shk05bct4/rawobufesobomadoforewodis.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/xarewupibopenuv.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/91036354420.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_off0000cb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B5 10844 bytes
SHA-256: 37994891d782280c6e75f36a1d8cff66f2c844a88c356b3e7caae514b6e4f05f
font_02_sfnt_off0000fce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 17032 bytes
SHA-256: f371e5e406a92834831808f0fc6a1ac9d0058f75debd4969c4ae024fcc3cb13f

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