Malicious PDF — malware analysis report

Static analysis result for SHA-256 33796ca68c4f66dd…

MALICIOUS

PDF

83.2 KB Created: 2021-08-26 04:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 180a6afde6ef9ba959e27682f1eef6ff SHA-1: 3c15ddbbdeab73d307d77f75dcdbf515ad8d148b SHA-256: 33796ca68c4f66ddc29f36f68b13e151f86d2ca8d632e052b39140a44b2987d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic firings indicate this PDF is designed as a link farm, likely to redirect users to malicious sites for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=request+letter+to+come+back+to+work PDF link annotation
    • https://fenicia.uy/fenicia.com.uy/uploads/files/kupowigejukaxemefop.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/vunadukizukolomo.pdfIn PDF document text
    • http://geose.ru/userfiles/file/pabativipadokuni.pdfIn PDF document text
    • https://hirurgija.me//files/25297002581.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104878e84104---19014385311.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088b29b95ac9---38983372950.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/10953938400.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/58804869121.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/vigagifibugiguwotuv.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/novuna.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/3b9a1e8fe2680595bda586d34091ed81/tenasuwu.pdfIn PDF document text
    • https://0900107678.com/upload/file/wolopeg.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/29524030219.pdfIn PDF document text
    • http://annabarons.lv/files/files/lasovugo.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7a820af5b7c833a5df6f64d52ff7815e/bijukaxebap.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/e94500fc70db243a56db253f2a2f5b86/dojane.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f671ba3fb8---pidifometuguwulaseludukov.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/99781003832.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/51379296364.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa6e10ce0c---pirikezamoni.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/9354954866.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161216e7a40bb6---fujenokuwuge.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/14829499095.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/75580569267.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_off0000e2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D2 10804 bytes
SHA-256: fcfbf585241ab3b9f64368d20d0d983d4904588d707421610d2fa6415596a2d6
font_01_sfnt_off0000fbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE5 16356 bytes
SHA-256: 71c9c6c4e1b73177e87677b354773f4414a03367c224dd8c9184f9b2118a4ea8
font_02_sfnt_off000125f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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