Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b6c702b9a5c130…

MALICIOUS

PDF

82.9 KB Created: 2021-09-15 09:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 15d143e5b5c27ff8b8959646b4314ff3 SHA-1: cec36a98516fb627041c6c1485863a244065e62f SHA-256: 97b6c702b9a5c130ce9dea355774cd52622e829d2f83fdc320841524f297c8af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers strongly agree. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=gearbox+for+car+parking+multiplayer PDF link annotation
    • https://creteotels.gr/FCKeditor/userimages/file/vemawoxokorunudevafagub.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/63417395319.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/74641551824.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/woreji.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/68524818400.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b8db5e442d00e4afb7652f0e8199418b/66364715502.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/kugamikiti.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/sajemijawugisilenakudozo.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/vutigifaxilila.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/71609338405.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/gidaduri.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161417648cee58---19145725373.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/73970011849.pdfIn PDF document text
    • http://apvn.info/userfiles/file/pukiro.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/sefatofabuzi.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416694c61ba---vigisis.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba3611d6b---xonigo.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b40181d361---lavusutinivirakuza.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/58756377447.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/82595350568.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/8897246503.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/53764972295.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/maxedazosirelone.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/28574183321.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/918ebf630b493bd0b8c5dd67a180bc1a/70916983356.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_off0000dced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCED 11240 bytes
SHA-256: 6a2a6b75ffd54aa0e5235ee4e001e7e7a64bb22297c3e3850ebd50fac1757057
font_01_sfnt_off0000f718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 18052 bytes
SHA-256: 25c3a24714d4078fdfaccea517eb9faa676abfd24b5305bf31ac845aec8376b7
font_02_sfnt_off00012598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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