Malicious PDF — malware analysis report

Static analysis result for SHA-256 3968e3a9df4d9533…

MALICIOUS

PDF

77.3 KB Created: 2021-09-26 21:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a68d2f5fe35c77ef605eb04deb8c515f SHA-1: 9a3caaff5031e6ce33e5f6dfca8ddfa9b3e19ca6 SHA-256: 3968e3a9df4d953379c93f1d81c8f729fb00871450ad88f4faba50f10e5cbc25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded URLs. Several heuristics indicate it functions as a link farm, with some links pointing to compromised WordPress upload storage and disposable hosting. The presence of these links suggests an attempt to lure users to potentially malicious or phishing sites.

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 http://toflight.mobi/attachment/ckeditor/files/cad65edd89d69362d07d26658e22cb16.pdf In PDF document text
    • http://marchmont.ru/imgs/file/zebogo.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/93151578353.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109112003485338.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/57424890376.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/jodesilomimatam.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/29706906486.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/xawukixowexonugavifope.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/76760944683.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/dorajotarafasukosubiz.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc8fe0c09d---fisumixu.pdfIn PDF document text
    • http://3q1p.com/upload/file/210912213846586002jkwzj6jfovtb.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eb2ce690a9---67776089624.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/vekisudaxobe.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/rajuwesazuni.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb3c7f4208---31191314404.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/widogulupowuwepuma.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/71469163159.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/tidevabote.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/viwaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pokemon+ruby+rom+jpnPDF 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_off0000c135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC135 20456 bytes
SHA-256: 4c6c58f9fd2006b7e7880159d2a6ca012760c696b96f00c548dc78a526a217dd
font_01_sfnt_off0000f6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0A 10424 bytes
SHA-256: bb115ee7f62161e947311c7bdfc9cce4b534ff930826ed1c7dd97927b998677e