Malicious PDF — malware analysis report

Static analysis result for SHA-256 b000412f21778294…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 05:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a78d7cc6ad440a77a85e6028ea3ccd35 SHA-1: c17002939e33f184ccef25bd0d63723f8396dcc8 SHA-256: b000412f21778294c72a3f8db5aa7e56b48781db55725a0775c2a5a681b258db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of `utm_term` parameters in some URLs indicates a potential phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=imdb+ad+free+apk PDF link annotation
    • http://rapet.hu/files/61232669688.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/vazivug.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/kafovovurovelej.pdfIn PDF document text
    • http://ciskmv.com/css/file/katipidogosaxegibaka.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161347dcd3f551---50332753641.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a8a83103---64896804766.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/7545132975.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/61307921820.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/17470318431.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/61799410186.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/rokej.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/dutibibuso.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/54653091234.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161302df3d786d---zaxovatuzojiwos.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/janusupu.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613489b26d4de---putosidogaraluj.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/mizozixapozesirejudeviki.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/gazurosemasafivubeduremul.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4b8d9f62---ligizet.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/mafusibazapofisubepuzowir.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/zujugoziserodixaleguw.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/mogokuwusoterugurada.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/1rhlhgddqap7pe3bogaqb40doj/50714249463.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/rofuxifexirozosefolu.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/91180363439.pdfIn PDF document text
    • https://506hlapeta.com/files/file/48158138610.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_off0000d749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 17220 bytes
SHA-256: df0aa0f910f5f5f4a45e28f656d354e666b085b790a597e2f8c0ec642f69589d
font_02_sfnt_off00011bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB2 10216 bytes
SHA-256: 8e3b107bfe8dfdca966b831202c0e3cfae7395f7aeb4795e9d7c561db0195287

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