Malicious PDF — malware analysis report

Static analysis result for SHA-256 653580f8bc51ee98…

MALICIOUS

PDF

73.7 KB Created: 2021-09-05 22:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6846b1122a596666de44b3e430e88f24 SHA-1: a80b12ea5a528d08259cc473ab2764f47a4f807e SHA-256: 653580f8bc51ee9813e581df98ccc40ef6d39f21dff58430d536eb8f29ec9d6e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites, some hosted on disposable domains. This pattern is commonly used for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/71533182141.pdf In PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/28e68c9c25176660266b8ad58e98ddc7/20837361635.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/97827058275.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfcf1b8547---napazizonutoxuzelixezanav.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c588497b5---xopufepi.pdfIn PDF document text
    • http://asvpp.fr/pdf/suxuxasiveda.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/rewapenodip.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/13113804552.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/60f4fd6c01371a18d737e5faba590f5d/74439838472.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e47e824beb5---nuributun.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c6b4d514f8---fonilojizot.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/boxurojikiz.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/gamegekane.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/48120493363.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f86d7c1072---tisokonuk.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609353d0ddd3e---xifubudisexaromigumi.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc35fa1f3a---30163042535.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/abr8jn8uo49d7v6mov2b230f8a/68555902456.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/sukogobuluvufanegasamon.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/39445161330.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/54192229328.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c7af72c9957---fupanawujebilepilusali.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/91628397611.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210904010148_iaej2s.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/8e013c1c21289fe02fb1fa29cbf645dd/1403534852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=convert+pdf+to+google+doc+without+losing+formattingPDF 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_off0000bc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5D 16640 bytes
SHA-256: 3179827d780536b49b1da5c009115aa4be111b6a0e2ba9f0a446d7a9ed6b6a77
font_01_sfnt_off0000e673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 11352 bytes
SHA-256: ab48dd804c5113b7866da12c0477d63999f35b289ab7b877f246552bac362a68
font_02_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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