Malicious PDF — malware analysis report

Static analysis result for SHA-256 115d86bbe5c1b48f…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 05:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 10392b035cc9bff677cf3a187faa5109 SHA-1: 46372b9dd443a4306a405bfa384fd89af1973c57 SHA-256: 115d86bbe5c1b48f4933a56633875091af5078beb92f2e01f05ff58895e3a73b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/lb2laopnao238igl7bmtrjss73/17753848795.pdf In PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/61420155485.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/manurixexazaz.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcdb96940d---93548438399.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1e10c9eb7---fizetigoge.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/86209932758.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/22231879809.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/buwubuxoxoze.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160737bdab9edf---61298400839.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/66973798597.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/62936100875.pdfIn PDF document text
    • http://susanirvine.com/clients/82887/File/74603253277.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/92787928443.pdfIn PDF document text
    • http://ezibra.pl/upload/file/ripigus.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/75327285440.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df59e744b7---zidigatopuxomutulipu.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/29513680017.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/16200836116.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/88098628259.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/34863241890.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/zijidawaxajeguwabox.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/da353fe35330061e0e7a62819f6cbd9c/nedofakatuzufojugubexi.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/361dd98bd35219ee1517ff143537cdab/66183686241.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/af0ee5865eb7a875c0069153d5d1768e/zetiridibifusotu.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160773cc04ca79---mipojipi.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/qfh8m8b9rm9rvvcqorep7fq860/zamonixutuvowajaziguvaw.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608534e367d69---bepotoweperit.pdfIn PDF document text
    • http://slovoveri.org/userfiles/pozisejusano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=it+doesn%27t+have+to+be+like+this+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_off0000d191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD191 17312 bytes
SHA-256: 86fa06f74507dc4128007d1858386ad5c69caff99a74a9c9c6aa94e06bfc94fc
font_01_sfnt_off0000fe53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001166a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166A 10776 bytes
SHA-256: 975af48116bfa95a11f98ba5f71a89fe179af16b290a68ef37324767aa47b574