Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e8dbee626dc3dc…

MALICIOUS

PDF

89.8 KB Created: 2021-08-02 19:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: de929e3486e7e7bcdf5c4a91ad4f34eb SHA-1: c27df4e7ebc07a2d3bf0e5cf5f72c032600ff24a SHA-256: 85e8dbee626dc3dc2b30eb7d5ec5514b571663546e66210f3fe88dc4a9feab37
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 0.9985

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 http://suapaiatuipelehakefamily.com/clients/80707/File/52666363061.pdf In PDF document text
    • http://tunglamgarden.com/images/fck/file/17285558500.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/56985563231.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afb180cb879---16435953739.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b51bf7874a2fff6e7b2f4d4637af2bbe/78854431348.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/e0aa7b9e45004f3fe5dbee0413f24e49/vederixugorag.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/24180074178.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/5b2219e25fda9d826ad14889d17ae306/93786248816.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/46388257028.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/tuwilezupoli.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/1f7abd4de3282eef31191248df630a05/rijubefimelopagu.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/vogatujejazisanafiduromo.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/widepixexeparewazezu.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/desanopejusaf.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffdd84b686---21608421300.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0357b3e53f8c5aab94e3a0b479366ce3/dudalevigefusutuse.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e613bb33c71fcd9ab93b5ad4333a9122/monozerazevejov.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/kepegifufawusanus.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e29089995b82ca05159a8119a80460f6/3401521228.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16104caa14cc6d---44014923819.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/50440495313.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/vojududagej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+install+minecraft+vr+on+oculus+rift+sPDF link annotation
    • 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_off0000f978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 10740 bytes
SHA-256: b52cfa6d58242dc62e814b27028d6a924bd967c4da31fb8152971df15e6adb8f
font_01_sfnt_off00011229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11229 17512 bytes
SHA-256: a4aa3a4d85d18a5d001f1ac5da12d3fed4541a155762fa05c737ebb6ef5dcab9
font_02_sfnt_off00014007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1