Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56638e3f4e748f6…

MALICIOUS

PDF

81.8 KB Created: 2021-09-23 17:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 74bc075d4657fa4fa9068f8e1e379164 SHA-1: c023f0b368b7ef8191da01bf586ae997f71a72b1 SHA-256: b56638e3f4e748f6dee46c45cf968ab245dbdb2330f38a824f64d2807dc656a6
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress upload storage and disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=what+is+the+ant+radio+service+app PDF link annotation
    • http://cathugo.de/res/wysiwyg/file/dokuxik.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021091305053673499.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/pemedejujivi.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/36001066483.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/mopomuveju.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/tupatulobi.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/lineloguwap.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/venerebizekef.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/4676539303.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/36498846694.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/72240342221.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/ratiroponumewuwasoliwogax.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/kivuz.pdfIn PDF document text
    • http://copab.tn/216mag.svn/uploads/files/85467440751.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/14529121469.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed158b065---ragosokunov.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161395913213a7---84776050462.pdfIn PDF document text
    • http://chapelguild.com/images/usr/ruwoxarerugujepom.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/xirutexigej.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/3352390087.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/43562803226.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/98213606457.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-06/images/files/72259001438.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/46570418641.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c99bfedc3f---rilonumij.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_off0000dac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 10624 bytes
SHA-256: d9f721d0c82768c415f2eca98c5b0408fcf195382643befa3f69bef6d9592089
font_02_sfnt_off00010b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2C 17584 bytes
SHA-256: f8e21b27f1d89bcf2f527450eb61f3892c5ebfd086ec93e95b293b1e26568710

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