Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda363e76474ffe4…

MALICIOUS

PDF

76.5 KB Created: 2021-09-02 04:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4530d311fb27a4053b6051ce6038ea59 SHA-1: 6358aaf641244788be25d2632a1c7a852bc7131e SHA-256: bda363e76474ffe4aa9ac1178cb16009da0f3bdf9d18254a2ba4bf9d76b2e8d9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://barcabianca.eu/upload/file/rosiwitizedofuwimeka.pdf In PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/6d77f6223d3372cd4d78eb99bca7cb76/nareti.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/70933240470.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/pakupajas.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/42257699934.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/13175316428.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/watuxefezeveniz.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/xiguzerumajekojusef.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/96135067102.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210623170213.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/sifojotiropefidajaje.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/momovuzipasanuboz.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210803_AA150A1F3847C81D.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/93d864034b42d668025996150f927e2a/53068068318.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/70361109537.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/1374201439.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/12012278775.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/19451821164.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/gipelojomuz.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8899cbb42---kenexixuxokenogolojovoji.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/fuvogowexes.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/relod.pdfIn PDF document text
    • http://winso.tw/userfiles/file/35249889000.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/35082749553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ridley+creek+state+park+hoursPDF link annotation
    • 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_off0000c772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC772 16492 bytes
SHA-256: cf8b47139c164aceefc66005cbcca9a0fa70cc167b0d451a9578c77976709748
font_01_sfnt_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 10860 bytes
SHA-256: 0b3719c0c10c0a38bb4add13349b06429768f12c636177ee8596dd83bf766b23
font_02_sfnt_off00010b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1