Malicious PDF — malware analysis report

Static analysis result for SHA-256 9812b8f2ab4859eb…

MALICIOUS

PDF

83.1 KB Created: 2021-09-23 08:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cb5198b366a91c42ed8a2226aba3bdac SHA-1: dec71506243dd60b3b1d8469fad8d7b7e818a4d3 SHA-256: 9812b8f2ab4859eb487009d84b0e8b2f6adab394a941f70309e76c8efe811335
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on various domains, some of which appear to be compromised CMS uploads. This pattern suggests the PDF is used to distribute phishing lures or malware by redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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=dwg+viewer+android PDF link annotation
    • https://ahha.az/userfiles/file/39918455025.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/15810555242.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/58444743829.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/39881219650.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/87448387754.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/76028362352.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130232fdbea3---wikedetevasunupado.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/48832139550.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614b87b5a788b---jewat.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210918132919.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/wiwolovanipaburafu.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/kupopurokuwuke.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/19177289827.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/7235436412.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/lalasamelu.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/lowiwaruzikewexizo.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/weluwedosanilo.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/1365033042.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1a290282b---jojikagowuboma.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109050613553402.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/solumazorotipegexiloluf.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/vopusijov.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/jidigulebeg.pdfIn PDF document text
    • https://ijp2.com/contents/files/zixovogedezalenik.pdfIn PDF document text
    • http://ping-property.com/user_img/files/sasalarasadug.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/39377995786.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_off0000e0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B6 10264 bytes
SHA-256: 022d76be824bd118973eb11f183c1d24524f58122f5df1321aeb3eeed97abc3d
font_01_sfnt_off0000f7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B3 18364 bytes
SHA-256: 16f5fb63bd69d7c1c0850938802b295b8749de4692a3a89b58f0bccae3eb6666
font_02_sfnt_off0001272f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1