Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeee399a95ac6b3b…

MALICIOUS

PDF

85.9 KB Created: 2021-08-04 19:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ae655c59287354cae751e913f363556b SHA-1: 961a189505c17554294eda45d2435110a6888db0 SHA-256: aeee399a95ac6b3b3de3f409f59663149ca4fe6dd2d7b29d462c3988e3f5e723
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. These links are likely intended to redirect users to malicious content or phishing sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d004ea5936f---40008098166.pdf In PDF document text
    • http://ttworld.hu/uploads/content_files/files/35054418687.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/96318208237.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/79927980337.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e826bc707---21918928796.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160849dbbcec4f---xiwudinemufi.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/setiloze.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/lokad.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/cd0fb1789dff63b92464ad819571c198/rekufotij.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/62b06dc7247ea4f9ceaae2c152cb7952/tijaguvobuweg.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afb3bce8d4---30188393052.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa04bce1260---91906359513.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d18f4198c78---85427806919.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/sipasa.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/83179853045.pdfIn PDF document text
    • http://francisfamilyreunion.net/clients/870293/File/51338703738.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/64968020878.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/b98a3a5ae3b9f57051234d6478888aac/51031335349.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/gadugiwipeja.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/vowugafuwedaxemize.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/rorovexep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=coast+guard+uniform+regulations+earringsPDF 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_off0000eb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10379 16636 bytes
SHA-256: 7e11484eba3d4af7d7056fc026f6d202796a65aec2432fa66d8dd2718550f734
font_02_sfnt_off00012eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB2 10828 bytes
SHA-256: 1839e5158f4d81154bde2b1ef37142326d0547d149284d2b818b464c6a06d789

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