Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d1eebc652e3329…

MALICIOUS

PDF

97.2 KB Created: 2021-08-25 11:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bf9d6d5212d45938abe8ae70e3769f74 SHA-1: b55ba89e358f477a4fdc0c75c3860c51ef3486b5 SHA-256: 54d1eebc652e33292e93966462591d4d6fb6502895b33518dcc5b51636d5b0be
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_RANDOM_URL_LINK' specifically points to a PDF hosted on a suspicious domain, likely serving as a further lure or payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=grant+writer+interview+questions PDF link annotation
    • http://shengnabei.com/uploadfile/file///2021062923553278.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/fmpf03dish4n4netnpdujqvmul/jawafizopiwuva.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609cac9f2b3f0---80077901270.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/parudawinigivubima.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/wobipob.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/42c3f4a28d0aac9e1eb041449318ed6c/52380262713.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/jopolofibetutava.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/3843c55f28c23d7f34465e16face643d/457173264.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd9c6dcfc5---jakulojabaz.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/lukemukexifu.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a37dc88c60---89691550129.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160890d365685c---sinus.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/suweremaloranovanotorodit.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff797cb31e---tamifapuxovuxa.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1690cb7411---49792019021.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/uakuah11v189lsm5m08cnkb6d7/pesadevudi.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/5b0f420b1266df38246eee3aa59dabb1/50356470219.pdfIn PDF document text
    • https://primer-spb.ru/files/files/2328042682.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/5ccd17046720a63be3ffb2b8f575f4cb/pudusozogamisopimu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074265477c48---56018287810.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2b34085c7---getalovu.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/16873196252.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074a94325412---35691336184.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/xiruxitajerudumiz.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/tuguva.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/2559419186.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_off000118c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C5 17476 bytes
SHA-256: 6c224ab9e0764d3c33e98bfa399bf48299cfd2737ff06c4b8c2d3a5f41647ac1
font_01_sfnt_off000146a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A9 10492 bytes
SHA-256: ea11a086caccf5cf6153b103fc65d5e21c952f09ccdd7f0e70e8214b12e17eee
font_02_sfnt_off00015ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.