Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b0478609dc3606…

MALICIOUS

PDF

94.5 KB Created: 2021-08-09 18:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 3cf9370eeb2fb13df996fe3822ebfff2 SHA-1: fc43cd8f153c3c92de618ed2ed46c32c75b374db SHA-256: 72b0478609dc36067d55aca9560b0aa6913c751c90bddd80756a8644f944e92f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised WordPress installations. The presence of numerous URLs, including one with a 'utm_term' parameter, suggests an attempt to lure users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://irlanc.ru/uplcv?utm_term=how+to+mod+xbox+360+with+usb+flash+drive+2019 PDF link annotation
    • http://cafemsoffice.com/userfiles/files/lejefujanosedadumoxud.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/5182162431.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/vofinukawanoxexeratupo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f8f7ddf4a---49394991717.pdfIn PDF document text
    • http://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/jawezoxewomexowumoxiza.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105fdd9d34f8.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/47cd32f54a3c6b80b270f89099380e75/80047255496.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082047f3bc4d---86058415019.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d207e6dbad5---67627033750.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/bixuzojominimi.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afda800510d---49871549367.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/uutcppep9n0nrdj0cl9q8jd530/soralupemefitewux.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd89f71977c---kasezopabizafikozajunixu.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/7297a6ffd80bde7920f58fb7da237e85/47470410401.pdfIn PDF document text
    • http://santeh.md/img/files/40310769097.pdfIn PDF document text
    • http://beiks.info/public/file/40242625896.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/6jgreuacn8rg6ct0gpqa8qvj77/zazogujomemifiveweto.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/aa3807b9e0798c7a83d5600675bd8ff1/kofugeda.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/70494375354.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/780171b4fe8e21e43822b0037951e48e/44683360436.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e22a4d5c336ff55ac2f54f26985c1a87/jozud.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/06/20/numujejujimo.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/48753152929.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16102b9daabff5---giwuso.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_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 11804 bytes
SHA-256: d0704c177b44d371e4d7b4787bf26598f97a6b47fdeb07fcd3533ec2d70ba446
font_01_sfnt_off00012355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12355 19084 bytes
SHA-256: c9f1aa71b3766f80c2764a2f888079cd0756658d03b084f8b433eeba9693e8c9
font_02_sfnt_off0001534a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1534A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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