Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b53081f9728cb0…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 09:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a0d02263b7206b3b95e3d30ba4048324 SHA-1: 792335e4fb8e8ac3833456edf1c83cadfb1d520f SHA-256: 44b53081f9728cb05f72a7c8a130105dce3ec58fd834ea26f8afd8ed0ab94e02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=miley+cyrus+sexy+gif PDF link annotation
    • http://mrs-edu.com/sribati/editor/uploadfiles/36493257101.pdfIn PDF document text
    • https://agros.net/uploads/file/rifiremumajadokanodozose.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/89752583713.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/puligu.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/54637074eae3fa566b223290f7805f85/beloxumadizup.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/96545887561.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/dbcfdaa8f2db7c7b78e8c5fabf183059/neguladinikumoro.pdfIn PDF document text
    • http://attlas.center/userfiles/file/14012849620.pdfIn PDF document text
    • http://abworder.com/uploads/files/zunakekajuvewebuw.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614277091d1c0---35341593753.pdfIn PDF document text
    • http://runo34.ru/attachments/file/20127768706.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd871638a---15440697483.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b41e7d113d---vugofanofomebepipowegit.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141c5b1e4608---gewagupogapak.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/55468171287.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ead9772632---temizanifiz.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-13/20210913063339988896.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/movinu.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/wojofegugigesa.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/kebatilatadopoworo.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/tiguxonedemuwi.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/pozujuselibonobexede.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/81809857096.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/rupivewubikovitusizot.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_off0000df16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 10336 bytes
SHA-256: 5c4b77b4f446b279248fb1f633f0599db0d4d22d61084e23571db9b1d69b3e34
font_01_sfnt_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA3 18084 bytes
SHA-256: 02e2fa4e2c68c088d2ca0dd5ed9ab2d2cfac503bbceafa56556b6591b4f2667a