Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e10154c9da4a34…

MALICIOUS

PDF

88.9 KB Created: 2021-09-17 04:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ccc69b2c4cee846fb481537843d9d351 SHA-1: 0d9e6957ba893eb56500986481361ee59320b9ee SHA-256: 49e10154c9da4a34ada7fef9f321ff518fd19c03514131ba5d23d83ccf6ff0c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URI heuristics further supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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=xiaomi+redmi+note+9+pro+vs+poco+x3+nfc PDF link annotation
    • http://gildiamasterov.ru/userfiles/file/wedijejivuvofafo.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/86741159647.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/lijoxomafufu.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/95006445200.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/xobutawobunifabonel.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/27483059766.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/92349669303.pdfIn PDF document text
    • https://kapefashion.com/files/files/45080571190.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/munetolabavo.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/73828379018.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/42147881239.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/31697540882.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/23150265960.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/dagijesopowovizodirikijog.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/gunumitu.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/jepegoxomopafozoguxoti.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16130aa7c5459e---zanulewosalipetebufuzir.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/918a56d2b491d309cba87778a8a2972b/46877689718.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d880675b0---juzewopawavodo.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/kuvudobo.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/67517859109.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/safitakebegijavasoxezute.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/14114643407.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC2 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_02_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 11252 bytes
SHA-256: 893f5eafced207b99979f3d1a98eb9ba312ed801c1585f44140da724b5b69bf3
font_03_sfnt_off00010fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD5 23080 bytes
SHA-256: 166a97d06d21c8bc2dc60451342d57e7f291fb542cd61f5cd8e4fc56117b5a06
font_04_sfnt_off00014ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD0 2208 bytes
SHA-256: a02f211a3a941ba0c27cf07d0bbc88e222fbaca77ae76a0dcaa0185bbf46934e

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