Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4b32cb89b63d0e…

MALICIOUS

PDF

73.9 KB Created: 2021-09-02 10:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6f22faea49e7f89e983dd41c7a346913 SHA-1: 0c4931b9c3f87d5fa22ea6ec6e2e227ca4c9734c SHA-256: ea4b32cb89b63d0e7fd745b98dfe2db04cebb79f0f08a7c37a5b3fb59f9aec4b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised upload links and disposable hosting is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee291f4e560---vewitukure.pdf In PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9606ee5d---rekoluwojuzeb.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/bedemojikonupubamet.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ff871f0ba---mukidafodulig.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0bf945af55d78d652e85241c5dbea11e/rufazizoxegulujitonasejir.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/kinesofup.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/lerabovizisabasidid.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/08fldrmatqkn23u3i9fh7tatcc/rereliwemolojur.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/22114104440.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16095e78c4defd---10083596557.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/64654602477.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/b7bnvfaarer7ophc2m08f2u9rn/45030911354.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/fejimodugomoba.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/p37rfqg0h9d2j6noh267a87b77/66266528087.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/vusepote.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cad14dca2---sadunedot.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/xovunoti.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/61412636267.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3c5fc6b15b7529d4953795eef90c1807/bunotovelilop.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077479233897---kapedumawuxilugawedimalis.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/namuralitegedek.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/lawajovurajoluvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=best+scripts+of+all+timePDF 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_off0000bdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D1 16344 bytes
SHA-256: fcf8fb6530e9354092790ce0c3734eef35303d0054dded7fa63e3b40a6379f3e
font_02_sfnt_off0000ff8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8F 10588 bytes
SHA-256: b47ff528fa96e13588c92f12d98e0765262f008d6a723f7b08af960a3522d65f

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