Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf11538738d8130…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 10:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1041ae639f771cb2f8c2cc92a920a86f SHA-1: b5a61d108528bd42803f5406df7880fd013f5b7c SHA-256: ecf11538738d8130ddc79b3bac3aab88dac7fb0781f2c86484f20f62e740c51a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to delivering a secondary payload or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://allytemp.ru/uplcv?utm_term=multimedia+information+systems+pdf PDF link annotation
    • http://xn--b1akwe.xn--p1ai/userfiles/file/luvuxudefive.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/53662673488.pdfIn PDF document text
    • https://peterdegendt.be/file/51197229028.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/noxotonijebubenezawu.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606efc1895c2b---fuzotajovevo.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/pbfg213ne38717qlhdohvkt0gn/22350410101.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/8bd14408ba7c90edcb4821e15e9d9a43/92862050873.pdfIn PDF document text
    • http://suurelepa.ee/data/file/mivudironamipikibimoden.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d2640c9b4---94951423358.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/cbf96849fbf5a539e18c70331ae5f264/noboruwonogipatokevimegi.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/bfd197ed8f35ed312c79ab5c52a989e5/35906223172.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/0e068f7d863b78ed9ee005d13bf57c6f/sanejepopizejegaxural.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/7uih65ka6mmaat9livmkk4c16e/sipix.pdfIn PDF document text
    • http://araonline.hu/uploads/file/90829600665.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/93589215623.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/jusuxawa.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/18297796630.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/mekanoziwuge.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/34963435861.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcea88d6cee---woxofejorazisofuwunoku.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/40a38cdbd42fdeb081ab0bacc0761a2f/vixuzevika.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22f512b3d4---66381587483.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_off0000d972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 18588 bytes
SHA-256: 522347753747aa9821355070c399afd3453be220e6e377a86bffab6914da8709
font_02_sfnt_off00012161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12161 10868 bytes
SHA-256: c67d39342923ba1aa9094b2e046c5b9bce310650a7989c4e63461bb7ec473e55

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