Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c95391ca9071e5f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 12:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 243d5c7cc35f9771ee7af04eecf433a3 SHA-1: 3c7d8a397c8d628097d7a1872d0aa825b977b9a5 SHA-256: 3c95391ca9071e5fb9b6527e6a937dc1f34d4b2533e87993d1f74def57feb6c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=manualidades+para+navidad+2018+pinterest PDF link annotation
    • https://kimtuong.vn/isc/public/files/fckupload/file/3625328428.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/muduteribetiza.pdfIn PDF document text
    • https://begili.com/uploads/image/files/wajebevodelufikuxojo.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160770194dcaa3---xakemufemev.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/pubomogifobofuxa.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0965809f3f8f0fc00f6bcee10fdcd62e/86636712890.pdfIn PDF document text
    • http://stroi-sistema.ru/img/kupekogusupexe.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/67df363cc851674dafe98266d3f2a1dc/jikozazakosalo.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rowojobonepiga.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/jamawiwo.pdfIn PDF document text
    • http://pk.mo/userfiles/file/95962185548.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/cfmulmsbkbn31nkos3vnp1ddaf/gabipef.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/dipuxofujise.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050705152080.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/nuwalejes.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/lsdo1sp0r2n3qtrv5f8q7pmmco/femoripudadasag.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844e395609e---85908087843.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078f095a1522---jedilevokodofivo.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/kasamademugujikiso.pdfIn PDF document text
    • http://chamdure.com/DATA/files/fukekifowugex.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/fb260d7632db1bbb5d4f60a4b01bd8fb/dazekurikekoderena.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/gilokabu.pdfIn PDF document text
    • http://timebymtm.com/upload/files/ronirowelulemarixa.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_off0000d1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C8 18620 bytes
SHA-256: 178bdc9bc76006c2e1411b318d90ccad7bb474d3b175455071ec99105e3b9e28
font_01_sfnt_off000100a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B8 10924 bytes
SHA-256: d4b89cfd58fe7cdaf88977a54c7cd978f044a2f99476e21be03d7f69f51e26f2

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