Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b96aa564e5a6312…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 17:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: baa73b894ff3080b43caec0d66ef1f92 SHA-1: 160d36a1b01170c732e2bb1bcf23c958f177d4e3 SHA-256: 3b96aa564e5a63128fbc674013c675b1f7f0be7c4a19ea069bba87c8ac7e0a1c
156 Risk Score

Malware Insights

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

The sample was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://baobianhkhang.com/upload/files/8908918592.pdf In PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/30482554731.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/90030922717.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/62577386955.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/texenesivuzesukowefelum.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/2uesg91eou0aeomb3euihl5f9u/54757434579.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/43412615652.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/juvuvovofixolovubu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6fd547d5a---ketezuwizerasuwawa.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/tixuvu.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161351a2da1f62---16719265787.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/gixijasudukesarex.pdfIn PDF document text
    • http://ciskmv.com/css/file/lipinufejonerizafazopowuf.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/39757038632.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613435af6c5a7---kijawija.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/73674357268.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/lekolaj.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/47136175164.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/b6bucaqfi71p7d0k2rghja0sa2/21114660185.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161386b0464a56---fufopiva.pdfIn PDF document text
    • http://wenfengsi.com/wfs/WebFiles/file///2021090303190868.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/zadajesomijovolobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+flexible+adapterPDF 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_off0000deb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB4 10548 bytes
SHA-256: c56b5f374c8f96d7a79639218b23e99bf6110a6feb8dd7aa183c56612b1905c3
font_01_sfnt_off0000f69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 16856 bytes
SHA-256: 13b09816794730c087a11feb0d005042de1e9ea49364f9094018f5df05570c16
font_02_sfnt_off00012260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.