Malicious PDF — malware analysis report

Static analysis result for SHA-256 8198e6c585158339…

MALICIOUS

PDF

81.8 KB Created: 2021-09-22 10:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77802a0160ed2c07d8392177ed89bd3b SHA-1: 98b058d21337ef8ad44443a181c0670c16e221f8 SHA-256: 8198e6c5851583390bcd3d7439574e52189d0eff307a90cb07798c8c3727b572
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many hosted on compromised CMS platforms, suggesting an attempt to direct users to malicious content. The presence of multiple external URIs and a link farm heuristic indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.delaneyllc.com/ckfinder/userfiles/files/pixekutasaxofeg.pdf In PDF document text
    • http://hitecds.com/userfiles/file/50958158013.pdfIn PDF document text
    • http://riversedgefm.com/files/file/kozisozesijakosakejurufu.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/01iploc5vhtr7f7jfk1jscaglt/63276358459.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/58065684245.pdfIn PDF document text
    • http://eecca.stocker-development.com/uploads/ckfinder/files/34878375035.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16141a0263b489---54740613163.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/33409799195.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/66087830160.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/zokafinazawamo.pdfIn PDF document text
    • http://sbkf.org/files/files/95554531499.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/qo819aqqfa8fd06fd9p3jvrkid/kuwumuzenefegakozu.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/11478696996.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cbfd7df0c---vunipudurapedepijov.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb2b68e56a---25286589530.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/27162945150.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/63834759557.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/77027778815.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/74513982655.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/91062096521.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614592aa00aa0---34947790750.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/50035049858.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/tovoramelimijuso.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/26356160661.pdfIn PDF document text
    • http://ud2-140.com/files/gizikilunizakimuvozu.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/volawokisepade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=videochiamata+tra+android+e+iphonePDF 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_off0000dc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC29 17364 bytes
SHA-256: d4a0ebdd9601290a026a133ac34d3d7dd3562dce98080ce66e016aa579761293
font_01_sfnt_off00010976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001218d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218D 10532 bytes
SHA-256: 755dd03289bd07360605cbe3942a988ffcb7745352ca0ea832fdd758b98b9fdc