Malicious PDF — malware analysis report

Static analysis result for SHA-256 af32f4d62e0e8e16…

MALICIOUS

PDF

79.0 KB Created: 2021-09-08 02:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 327307ee9c4a7186c85677fdc8852688 SHA-1: 4b0bf4787fd2839d9aae1d0be00cb4384beb8057 SHA-256: af32f4d62e0e8e167e85a7995beb8f71486add863582c12309ece7f576001d38
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=idioms+and+phrases+pdf+bankers+adda PDF link annotation
    • https://datawire.gr/files/files/ganarafomuk.pdfIn PDF document text
    • https://coil.hk/upload/files/begitilaturiroxarivoxup.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/zelobozokikonixaj.pdfIn PDF document text
    • http://imaginove.eu/data/Files/66655375947.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/45463192313.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/1ed5de4eb44c530687e3b2af23ed6883/75846589629.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/42946974152.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/pabifuzagovewewegimetus.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/34d7952badc3ab6a23894eaffb46e7d6/fafanomizapamarufeviz.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/26071853578.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/96554173486.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e1784d92229342e26eca6dd124387261/lamuwajovup.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/37869224884.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/ec1f03d2735879bc247e0cb52bd9050b/43276062001.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/tipilumolomodepiga.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/palow.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/e685545247607ba87679bd36de05dd73/79013170317.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/pozono.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/94895099463.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e667b367---1663912979.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805e1a22e16---67318580683.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/bigorixevibi.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_off0000d22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA41 17084 bytes
SHA-256: d5bee1763bc9e74c5695cea9c6b8da9c1ab1610a4918e381278a4698579c81c4
font_02_sfnt_off0001164d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164D 10800 bytes
SHA-256: 18c9ba64b03f62dba7aa2d37ff71a3bbac841695911dd5210b0d8cb78c4fcfe5

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