Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d893a395403b21…

MALICIOUS

PDF

79.5 KB Created: 2021-06-28 02:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b230c3fe9c198da7e0b7e1363a372fca SHA-1: 37bdd36ca93824fd79893ecf6062565f034c37d6 SHA-256: 83d893a395403b210799bd91f8ee2115329cf353fa9f0b50b54783aff6c5a025
156 Risk Score

Malware Insights

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

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, directing users to compromised WordPress upload directories and other disposable hosting sites. These sites likely serve as distribution points for further malicious payloads, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/h4klqcn4128nqesbe3srtol9sn/56923637033.pdf In PDF document text
    • http://mesamiesdallas.org/clients/e/ee/ee8f1390623de39be1ac2b47a321719d/File/21943098965.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/0rclru9fto18rgjqgrsksdst5g/siwelogasewa.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/43758076892.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090afb84f58d---29145479389.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/35151076223.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16093756960ed9---jofabijafepekukeko.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/612e0f3e91bccefe1624a2553682d28c/69008616150.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/0697c1505023cb8b2dc11542edf672a8/vireribopusofawovigiwosu.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/893fb98c4e4094b59806d5598124f286/pipiweli.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/40493223048.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/adbf8bfff6efb1777cc40333112bd1c9/91494470208.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/971e0288214c5de93930ccbf0bc314ad/luvafedejozalinowe.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/2b4h1l274iuolmjaifmgj9f4l1/67186753718.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b57a57e92c---23702925911.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf48f439ce---80455884782.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/4165accb9c59f561865a7c227e8fa3f7/41608992253.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/9185372216.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/455q9skb6e6ktbh89dq1ptq2h4/lupenirutagemonin.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/zeranufusiwigoxelum.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a72e422d83---biponanox.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/71010840514.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ahlejc558h8mb9p8q31i97o3m7/2502360602.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/90897436818.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/n570r98djtaadf2nq2ugmvbud3/vuwowasewes.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/38069429760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=color+by+number+addition+and+subtraction+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_off0000d368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD368 16560 bytes
SHA-256: 3fcd84ff82750e1da6ecf134b4999a9d96550cded8936ff49b8b02032fc0173f
font_01_sfnt_off0000fe77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001168e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168E 11168 bytes
SHA-256: 827c89e6d44ba8e9714ff9e98fe640cadcef44eea79b1bd741e41045697b9008

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