Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb3d6081649d06f…

MALICIOUS

PDF

74.6 KB Created: 2021-09-15 22:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 703bd1d92108a6a1b6a89e3a2881fda3 SHA-1: dcd3155431760e54d5465812f73ccb17d6a292d3 SHA-256: 5bb3d6081649d06ff3487a921e4bca84e2cabe947423bb4ae1b5fd6f76257ef6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs and the PDF structure suggest an attempt to trick users into visiting these sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://abogarestudio.com/userfiles/file/22228789838.pdf In PDF document text
    • http://dsacare.com/admin/uploads/file/28920836952.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/gagesigeruradozek.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/46151327063.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210906_A82FEEFEE2076EEE.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/82028080721.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/62515248536.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418eb36b670---vebawokofumuz.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/padatozufewakulemerus.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/fefebenit.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/goboxufajakerasodevojizow.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/97010746655.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/62c057c3ae92c14a9b4d3a149f207bab/18804885501.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/wagurerepimiluz.pdfIn PDF document text
    • https://emprenderem.cl/files/mewodujavoserulibom.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/84003877163.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/31618982402.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3ab383025---dabidi.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/42845011427.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/mukidigifelokos.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/4844234198.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/33493782992.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131c596e10d7---76277975970.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/20530546012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=database+connection+in+androidPDF 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_off0000c29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29F 16220 bytes
SHA-256: a4eecbf1869a63b25ff6d4aa47648b646bcbbd56f15b535a02c6e414d7a285fe
font_01_sfnt_off0000ec9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B6 10460 bytes
SHA-256: d3c4aae4052adb89dd853778e9af9586307a3f4fc6fbdf8074ce5003821133a2

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