Malicious PDF — malware analysis report

Static analysis result for SHA-256 5365024b3c29a47d…

MALICIOUS

PDF

83.5 KB Created: 2021-09-13 14:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c5eef8f38584d65335b9ca381774c2af SHA-1: 8a4e27810d1092a52876aedbca761679e8aa7524 SHA-256: 5365024b3c29a47d58950cfebe2aa15233e10f21de0a800ce95119ae006eef33
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The presence of 'utm_term' in one of the URLs further supports the idea of tracking or directing users towards specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pixomot.ru/uplcv?utm_term=audacity+audio+editor+for+android PDF link annotation
    • http://alituncer.net/userfiles/file/80501194160.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b15b52190d---zesunukokobitojuwap.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/71672812740.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/46471340047.pdfIn PDF document text
    • http://vit-physio.de/file/68725624605.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/wevizi.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/30189628902.pdfIn PDF document text
    • https://strechybenesov.cz/content/72668003563.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/9587328923.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346398254c8---93048493303.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/24154395913.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/felude.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/logujobi.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/ledozur.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613d16a6e22ca---60873726582.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/82401229781.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/sixaziketel.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134a20a0daf4---reguloralizovo.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/abg5el3pjofumfk0qgfn6scho1/99611908074.pdfIn PDF document text
    • https://iwistw.com/upload/files/boperodesewo.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_off0000df00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 19056 bytes
SHA-256: 7935900d025b5f2d0bce64a6d5ce06033d738a96905b712066ae773ddf8a5d26
font_02_sfnt_off00012889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12889 10448 bytes
SHA-256: 2ecbaa49b0e8da5b125ae69315314e97708b26ea55dd195aee4b809548597273