Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dbcd4777ee644de…

MALICIOUS

PDF

88.3 KB Created: 2021-08-09 04:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3faeafcb6ef3100e7c513cdbfb15eb3c SHA-1: 65f29fdd7b7d745cb1abc7ab3d4f41819946f6b9 SHA-256: 1dbcd4777ee644debff02a10c57ce4a9ce026e7b334714da8bb2301a4f9dd0a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to external resources, many of which are hosted on compromised WordPress sites. The presence of these links suggests the document is designed to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://chcial.ru/uplcv?utm_term=20+root+words+with+prefixes+and+suffixes PDF link annotation
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a7396e0f8---mesoma.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/89573078624.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/zuwizerakuki.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160728c80b0575---xisumariwebejutag.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/79849949187.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3da3e985e---78981282952.pdfIn PDF document text
    • https://vozilasavozacem.rs//files/98065916010.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/lomapu.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/xuzufasulegawelanim.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8597c7fa7---72730500635.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/md12sh5qlou2dsng2n7rfsusod/72883445308.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081759dd4e0b---nanigusuwapagabarasipawa.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/jusogolojolajixomak.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/3dae78ca82a9a3c5593399df097a9be9/51037831572.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d94c82197---vulozonerudidejejevitigad.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/mamerafulud.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/iodj3rlfao591krqlhmbpar0g7/pirilunakosatagex.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/gokukawezegimevixuduwute.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/il1okdq8btqhdqbutjqt3hdv6a/zidabijomudaboxufeba.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/0t6q0a023v0ncssqpvv2ofa1kh/97675118298.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/gavovoturozoxuri.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_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 16652 bytes
SHA-256: b56d7eec66eeaff2a883bb40c2336d2ce2e7006a031063fb2582cb1928dc5a4b
font_01_sfnt_off00012095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12095 10980 bytes
SHA-256: 652899d6eabdea5810c509fa394f9ae9b248cf1b4c166ea9d3ce47076d2d6cbd
font_02_sfnt_off00013a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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