Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ebf3d143868f224…

MALICIOUS

PDF

88.6 KB Created: 2021-08-17 04:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59ea98b37b53b890c2434ffe1e090e40 SHA-1: f2adaba45b10672e897496e38cacf4b81783a2d5 SHA-256: 6ebf3d143868f2242f257890b8b559a983142e5f4addc13353fad7d04490e84c
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggests a phishing or malware distribution scheme. The 'SE_INVOICE_LURE' heuristic further supports the attack pattern of using fake invoices to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://huntic.ru/uplcv?utm_term=buet+admission+question+2019-20
    • http://gdgom.com/upload/file/2106200942074315557klev35mi69i.pdf
    • https://aartipalette.com/userfiles/file/94093960648.pdf
    • http://ruresept.ru/files/file/39167780418.pdf
    • https://ahreco.com/uploads/news_file/xomij.pdf
    • https://art-eria.pl/mandarynka/pliki/files/xowoledarizagijit.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075e93277723---56051282855.pdf
    • http://shih-tzu.ro/files/file/zuxunaxaratez.pdf
    • http://melly-incendie.fr/img_db/debifiletadasixezisuwi.pdf
    • https://candbco.com/ckfinder/userfiles/files/kebuwukujenobawoget.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763ef49b577---guxogapirofezinikujedi.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/0985a16e5e4f9f337ea9e12a4fcd42c4/zesorafira.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/rujmtu5paohmqju0g8tfp66oqt/lofuwebipor.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/93f55647243949976fbb4694af964562/92911260219.pdf
    • http://www.hcc-cpas.com/siteuploads/editorimg/file/46119336906.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae26529c5f---mamuwefakimaseredo.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/d4d18930c5ef7be540c7679ac03d8860/tivata.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a00318b6a5---mepasapaji.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb1a126b9c---nelagowofiwibosowatagu.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/7e3d66a788bc873ea2c1622b7b11cb22/24282491073.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a759ef42f63---zexemuragokozerizodinab.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c12570c0448---35062208692.pdf
    • http://maihome.hu/admin1/file/10574230950.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610456d79aef9---zefineginajojemuwat.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/0irlf14co111rq98ir8m2c220o/memuzox.pdf
    • https://hanahana.vn/media/ftp/file/kafaxijuzovepawixovatuw.pdf
    • https://barcelonacentremedic.cat/files/galeria/files/28277682132.pdf
    • https://rumahbaruku.com/contents//files/zalorol.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f04e.bin
f1dc9ab84cf23f9afe0344351fe2f02897d04e03b4d70a7da8eb0d840fe016be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 17632 bytes
font_01_sfnt_off00011e5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5E 16792 bytes
font_02_sfnt_off00013675.bin
f94368cfb28e1e49296f8e89093bddf623e5604948ba6cc2fee2d7d25e51b6ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13675 11056 bytes

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