Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a6df1c081dcf26…

MALICIOUS

PDF

78.7 KB Created: 2021-09-04 14:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 77b90355e5c78a068af0600163f90e63 SHA-1: 08e8aba095e52a45b5e98d484e31adeb6aa91a6b SHA-256: f8a6df1c081dcf26f420943610d28329bb83133d5734b7a81a87716f2c507aa9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting. This suggests the document is designed to lure users into clicking links that lead to malicious content or download further stages of malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://bandotrading.it/uploads/file/59590733475.pdf In PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4d2114694---49133149771.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/ronuwezujon.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/s3gp07m02gtih3rn59vko7rfh5/sobilabidij.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/21522030155.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/e02c163d34eaba60633ae65c324397e5/316058611.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16125dfb08475e---67315518756.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/74813690827.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/23255788537.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/jititazipi.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/nixup.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/rotadunizidopalalosew.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/272301572185.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/86252080901.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc38075274---62013901841.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/zudevobepumugeruvopa.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f7150ad2a---bitele.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/oaeaet286p1i8vkjhtq8fccs18/merilebasoledesijanu.pdfIn PDF document text
    • http://riverbendhay.com/clients/4/4e/4e1cbd84181290ddb66fb035c9950ff6/File/91055078417.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/wapudavilenupu.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3f4135e82f---wikixuwomanakafawuwigun.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/12a22290d0124a4d4071c90e70d93317/petajazijusagolelidivud.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/21326126830.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1598e7470d---tukimugojeveguguludedogev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=operational+definition+of+self+esteem+pdfPDF link annotation
    • 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_off0000d025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD025 10684 bytes
SHA-256: a988444c5b1ba573956767aeb400c7efecf066df231bd31cb6ca8eed63931cd9
font_01_sfnt_off0000e89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 17220 bytes
SHA-256: f48a2e111468dbeb9d5039385d3483eefaca09adb448de9e504d4170a0604529
font_02_sfnt_off00011522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1