Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4cd4235660d235…

MALICIOUS

PDF

71.7 KB Created: 2021-09-03 07:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: be9611b972d5cffeba6613789b66d99d SHA-1: f3082e5587c6e72307045c198efa6d3038a25b6c SHA-256: cd4cd4235660d235cc2d3f4023a6ce930e062e2d36c634f26ad68f0412fdaa53
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish for information or deliver further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://curry-box-deluxe.de/userfiles/file/25851828683.pdf In PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/8jtk8a6rth14dmfe7h9mmkaub2/66130804601.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612b24694bddf---jelenivejulabogulekoti.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/wuxajijewafenerat.pdfIn PDF document text
    • http://hodori247.com/uploads/files/savutofokuwil.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dce91ddf522---36392374898.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/misaxavata.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b3971d4d2---61181763005.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a5abce47e---somamuxajoru.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/rafanosegijukekeladofuf.pdfIn PDF document text
    • https://stormester.no/files/file/wufug.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/5803900716.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/jojibosekuvivu.pdfIn PDF document text
    • https://mfdesign.hu/files/file/15381232986.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/kobatonasewujesekuke.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/57363289879.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160729c7183dd3---96434195717.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/68064330767.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/91d305c1be0bfeada216f1e5057c4703/faran.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/pamobevapipomaf.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/lemedezuresanodefilizevo.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/10237170943.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160fdfbfc2836f---38815557450.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/wipoju.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/12800741358.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076acdc21046---32321006700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ncert+book+class+10th+science+pdfPDF 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_off0000b7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BB 15484 bytes
SHA-256: 0257b9c134daa9c048ae197a3c19c606e877e70730be1c8d86b71ca0bdea51ad
font_01_sfnt_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 11100 bytes
SHA-256: f747209766279957a99aaa18d8cd1b4f3e2d3349f1b59981697997a83f5449cd

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