Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74ae3753d25cad0…

MALICIOUS

PDF

73.7 KB Created: 2021-09-06 01:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1648a0deff525fa7b896dafa4170e765 SHA-1: 648caaf65263a0f0e6786701144fcfa1bfd81f35 SHA-256: d74ae3753d25cad0e21879a740e5be7c65542eba4735b2d4ead9cf1476410ff0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to disposable or compromised domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the link farm and the detection results point towards a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://daotaolaixesontay.com/uploads/file/folizukozowimaziduguk.pdf In PDF document text
    • http://creatinglifeoptions.com/userfiles/files/xezesurisiwene.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/pibevinazefoguvewuz.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/vopodimanatekazagu.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/21019236195.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/a28a6a5dcc99b21c5ac271fd8c3587a4/33368254405.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/kugabijotemevok.pdfIn PDF document text
    • http://unseretochter.ch/images/file/wugexebuvizapamovezewu.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/joxedu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/77687862814.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/vozoralakeloniruf.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/08959a2c22658c0db4deb2675d6cfb73/tofinesipewuzudotiped.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/5c9ec04fcd698c3f020b17ec0ad73eb6/xafagugovixe.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839ffd3f90f---torisazigelimogakiv.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/futofonuvuvarum.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/75512030607.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835917c6baf---vivupijojopibaku.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-6/20210706044841717163.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/kutotibixoliwiporifu.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/17442451490.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/8d396d5abf9d3d65f4757f1124231b02/runujosavemise.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/19359245547.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b3d2ed263---1097433995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=12+bar+blues+guitar+tab+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_off0000bcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCA 10764 bytes
SHA-256: fe5100571bc87c3621321b9309b35be2d8d9462420bbb314aa2d8100c1d6146c
font_01_sfnt_off0000d551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD551 17100 bytes
SHA-256: 4dd175dea2d99545e03de6252fdb4d7cd9a7e4908beb6c7b355acf5937c91347
font_02_sfnt_off0001014c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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