Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9ee02a619bd9a0…

MALICIOUS

PDF

77.4 KB Created: 2021-09-21 04:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7ea80d56ccd1443a1adbdd8b4e1e68e SHA-1: d6d783628af15248561cc8691387ad5a7b0f5c80 SHA-256: 0b9ee02a619bd9a04b31956ebd897adfd1f59c6744b79b0d5c5a864ef94726d0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings suggest the primary goal is to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16143cf93a083b---jupasexuranera.pdf In PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/motovovofumonowimuteterud.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/6884557665.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/29800906899.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/negijabigifeken.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bafalori.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/dawotilo.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/83477594159.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/zoxibunoxemeji.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/89999264608.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/36262235678.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/vodofulata.pdfIn PDF document text
    • https://camelcarpet.org/d/files/86785233313.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/93534753168.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/regafuvujixilogona.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/75769758246.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613db15448753---99862602837.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/27790511885.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210909150824.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/kizoxi.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/wirefaferukegidig.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614785517aa0f---63982507159.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/xefexomigejaf.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/pojub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=download+animate+it+apkPDF link annotation
    • https://easyown.ddproperty.com/datas/files/75064914972.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_off0000cbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D8 10464 bytes
SHA-256: 8f2f73824eff692aebc3cb7156be80660b16658fb14ac908590e5cdf49678a83
font_02_sfnt_off0000fb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8D 17320 bytes
SHA-256: a1cbd9730c2a70550046b58f809477758c73fe9e4f7fa8d02fcb7f21b4ae2368

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