Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb40307ceb0381f…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 14:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: adb5b3a34902570645ee66a0ee21aac7 SHA-1: 974c589e945ee7394c21cf0406717c7d223192c8 SHA-256: 9bb40307ceb0381fa1d02d356fbfec94b656b36e8e3b495c8b3d5eff6430df62
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation or redirection to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://oniceh.ru/uplcv?utm_term=lovecraft+country+costumes PDF link annotation
    • http://lahma.pl/_u/userfiles/file/76859213357.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/zefizidimuxafurovunimo.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/dopexosiwi.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/vupomarigelakew.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a38803750d0---31632527368.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/zunofurad.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/42726952571.pdfIn PDF document text
    • http://jaika.in/images/documents/files/3662690806.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/s3vhcbqh0lop3d7ck3ajl97a3k/94591784605.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/9a2275f95b6ff366d293129e95e025a9/7903422964.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/xivoguvunusoguzo.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/2304adb58ce6bc29ed0e2fd4a91480de/tipavajeku.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/49216177759.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/tepagiperoworu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d01e69d2514---mobawuwupube.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/kojufapimulavurur.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/64096393676.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/3ph7fp0c3ogli58nltsfhe5puh/37709613192.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/gofon.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/3on8brh7de3b3gqvtg8tbp87np/61859658504.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/0eaebb17d7c6e1101933c56d96b9919b/podop.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///27920278234.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/b9e86ba0d0c9386e0db819ce39929705/mawogerifedise.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/remekubobovub.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_off0000e6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 17664 bytes
SHA-256: 59e7c03b09c04031e64cb38945d18f7e31b9d23e8175b352ed7c370a31664f63
font_02_sfnt_off00012bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF4 10596 bytes
SHA-256: 9cf7c2ecbe6239b6e5fefce7bcab917674682acc4c6785a73be2e22d45140b54

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