Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bbaee951ac2e1b…

MALICIOUS

PDF

77.5 KB Created: 2021-09-19 21:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 19ed8af1491f73fbde8d041e8f79a110 SHA-1: f99d91f6207b32bc8d59356f41e075ced8176637 SHA-256: a3bbaee951ac2e1b516ceb9a1a9cd21760725a0d1d45b03e40cccd2c39042173
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://tractorpulling-emmeloord.nl/upload/file/tiluxon.pdf In PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/22345798977.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee41a14f49a5e9e93dc4ec2a5bd8a9ce/zikef.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/84252294025.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/77034708175.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/lasuzevezegito.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/vanozupafemapamonu.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/39193478484.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/71809813387.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136efa4e85e2---67923806272.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/42770915178.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/50374029895.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/93073245892.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ho2hsdehp2oaogncv3i122qd77/94138386498.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/33017432408.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/mixokuxagorifutefewe.pdfIn PDF document text
    • http://teknis.it/userfiles/files/4703986681.pdfIn PDF document text
    • https://pixel.bg/img/file/fubizafumedamuroguka.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/99796113840.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/1781336362.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1c119056efed86d13475f62273f5cc8e/geforulilupawaw.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/vimuxol.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/11752462986.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408b1b694d7---13961176416.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210903_070110.pdfIn PDF document text
    • https://duel.pl/userfiles/file/bovefexipiwokelijinati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=new+approach+to+reasoning+by+arihant+pdfPDF 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_off0000c5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AE 11172 bytes
SHA-256: 0587f75f863cea5b9561299d6008179f4f991de6ad7c64a2bd53678d28680a84
font_01_sfnt_off0000df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77F 18812 bytes
SHA-256: 03d0202b553af7590136a054b0b5066376b444bb4c8fbc35b86558ba69e8597b

Open this report in the interactive analyzer, or submit your own file for analysis.