Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d8f2f1f3831b27…

MALICIOUS

PDF

73.4 KB Created: 2021-09-25 19:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 124076b65aabb0bbace99e28ee75ed7f SHA-1: e01f82ff1a578bbf5cb391eeabf0074fcf4004a6 SHA-256: f4d8f2f1f3831b2793f8ca95bc28f606ad28fb50a463efa970756f3ef37a8424
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=how+to+turn+on+no+caller+id+on+android PDF link annotation
    • http://struttur-arch.it/userfiles/files/19981724419.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613db5e3cef0e---240070836.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210923_9B4343F93F379529.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/940433fe586b155c08cb8522c1fb1d5d/juboxefum.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/de566a57107ed8426f394a6c63e2aa5d/29883447973.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/86146119382.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/zegelo.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/32322232548.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/14648411839.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/zalewoburifodemebuwixetev.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/82235474537.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/o45iuscqututi2phc5qoik9hnt/90206951793.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/97529728946.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/83923056648.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/dabigamer.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c0877c84aa---putimid.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/gamawebuwazodusogalu.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/t4sapkia7nl80e0q48gm0m6bmd/8157413167.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7411a48bc868489bcf0964ea94bd232/62814056292.pdfIn PDF document text
    • http://creationart.hu/files/file/94313945994.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/27755829418.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/20824985728.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/61793686179.pdfIn PDF document text
    • http://zerosquareonline.com/file/jukosozunakijaxiwixusive.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ff3106c5a---41855447245.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_off0000b7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD5 10372 bytes
SHA-256: 3b55ee2b2b3ba5756bb89bc466c4cf7c50169b4b463102ad10ad95f3cf448890
font_02_sfnt_off0000e760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE760 18720 bytes
SHA-256: 641914b999e4e51f56adf311bb08f522ae81ec5a685068f2a1e9042787a7cb56

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