Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae03b40649a23a9…

MALICIOUS

PDF

72.0 KB Created: 2021-09-18 04:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52859108adc00e9ed202dab0e150c830 SHA-1: c116a5204867882f99acd47ab25bece65f94a6f2 SHA-256: 8ae03b40649a23a9c84242a37834d28e1545f2bd924c96050f970353508a2a55
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 of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links. No scripts were extracted, and the document body was unreadable, so the analysis relies heavily on the URL heuristics and AV detection.

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 https://ketchas.ru/uplcv?utm_term=farm+heroes+saga+level+304 PDF link annotation
    • https://lifeteacher.tw/uploads/files/202109040113067961.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/91460571972.pdfIn PDF document text
    • http://teakdeck.pl/files/file/tiduxaverukajixip.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/82234162248.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/l2etloe6eo6670dsnni18prb9d/52497974204.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/zuliziwatoxejoba.pdfIn PDF document text
    • http://labsshop.com/d/files/sukub.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/88035227905.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/wexogefunonutegejaw.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/vulibepoxixoguxetaxu.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/nufedosi.pdfIn PDF document text
    • http://sabaparsian.com/ckeditor/files/files/porenipi.pdfIn PDF document text
    • http://synhbio.com/upload/files/52009891127.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/nirudiwif.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/jexizepexurilusozul.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/bemogezalezoxasufisapivi.pdfIn PDF document text
    • http://chayka-svg.ru/files/nupadazurepo.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ltug84gotegnfl3823gq6gub1a/senavoxegisizufawave.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109040430442129.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/datarolevoge.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/fapaxelawo.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/moxexusoz.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1da37eb3b---lasukibabiloloxudexit.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/94315404398.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc19a6bf7f---binuretipavosuzitobomelun.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_off0000b876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD088 16456 bytes
SHA-256: 0bece06a832e7fd16e77687fc525781f597e5965a029992bb1a82eff4893c5f4
font_02_sfnt_off0000fa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 10676 bytes
SHA-256: dfe856a10a78476858e960d43193888a84f7bd6bdaef598e385bbabd830b7f92

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