Malicious PDF — malware analysis report

Static analysis result for SHA-256 9614bb5a29077b5e…

MALICIOUS

PDF

70.5 KB Created: 2021-09-09 19:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7758124091c7ec5b50a55719c168924a SHA-1: 53fe1b3bf60b3adb15d9daeb31ede1d2af92f741 SHA-256: 9614bb5a29077b5e5bfe706ae56ddae1cc871d5ca52cc9bf629e17fd20074436
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, directing users to various external websites, some hosted on compromised CMS platforms. The embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pistant.ru/uplcv?utm_term=gta+v+story+mode+cheat+codes+pc PDF link annotation
    • http://planet-for-events.de/userfiles/file/70780319558.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161375186e5d9d---66399783381.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/futagojofilarapofixozulen.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/loverepev.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/beledesurapinagole.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/24455744905.pdfIn PDF document text
    • http://uhorder.com/upload/files/winarefaj.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/89683990699.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/senibufesevujusasinureg.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/29030577645.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/kupowaxifogavu.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/79410571910.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d42e492e5---xugerikinupuxizozesis.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/kuponavozomas.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/28281779385.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/gidasarebifezag.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137acebcebd7---pulusur.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ieta2jf6dliunaj1lnmuj9vuig/26889039201.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/6257103693.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/50274274782.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_off0000b227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB227 16452 bytes
SHA-256: 594dbb08124d58e61ea113dfa8eaad65aef345987394c30f616fa474f78aa086
font_01_sfnt_off0000dc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC28 10756 bytes
SHA-256: 6b450ca7f1391011b3bfae82ab5e36be7052dbccac8b94d524b6cc2c71b8e3f3
font_02_sfnt_off0000f50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1