Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19126bd1c70077e…

MALICIOUS

PDF

87.9 KB Created: 2021-07-20 22:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d8ab6a02e12b9e6100531a4e57c7ba79 SHA-1: 443f65c05ce42dabd3fbeaca82e6fcd97088f26b SHA-256: d19126bd1c70077e7800b04ed67236434e94b7af6db3096a1eb65a82d002701c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external links, many hosted on potentially compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://kup-vino.cz/web/ckfinder/userfiles/files/ladatubelonafulovesa.pdf In PDF document text
    • https://arch.ua/ckfinder/userfiles/files/70634219679.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/5fmaka26lt0ukbe0seviq33t27/gofinaretekenajedobif.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fc6fa16b9---wodizitimopuzesi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c454282d66f---sofaroboposowobeba.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a23eb33c1---joxuved.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/60219282089.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/zewopu.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/27957455488.pdfIn PDF document text
    • http://ipllaser.in/uploads/37332235788.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/19718230251.pdfIn PDF document text
    • http://berbun.com/user_img/file/bigapunekopo.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/61788883988.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c4819a6fc---vomopurixen.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/tivuzolajuvobugigidij.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/24799623532.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/zobamojijonutabodisiki.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/1d8968bc1e594b5246cf2b7abe9dcb83/xakegivugatatagu.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072423e6d93c---63264040687.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b97a4533c10---91584317132.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/07f3b9d0d8e0abea6aafb41a55586f70/manifisikamaboxebupilixes.pdfIn PDF document text
    • http://tano-cable.com/d/files/roloderumidomo.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a2cb1d549---kikiribafelu.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/caaeb6f3850645214ef3537680688a45/93482075055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=night+of+the+proms+2021+ticketsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 16996 bytes
SHA-256: 69626b2e9810fba92c3d1e83727bcd68f06c2059b682c348d8ef9e9ba01edb29
font_01_sfnt_off00012096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AD 10976 bytes
SHA-256: 96bc4f392d2c11386e23f890dbad1c68b30c3c157ab63f3db6ba4bd76438378a

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