Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc26ead70f202a7a…

MALICIOUS

PDF

73.4 KB Created: 2021-07-28 04:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5400e4960bdd4de1ed82496e622d6737 SHA-1: 4f0337412154dca97b4d58b6071368c26b686cba SHA-256: dc26ead70f202a7a9d05f5258c7dcab94daca9520c902d41379f57b4d84fb021
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://olympusflights.com/files/files/60721328295.pdf
    • http://medtravel.pro/images/hand_uploaded/files/damowopebudusuzaxagijo.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/eqa001iaibtheug2cbst6jitje/devufisu.pdf
    • http://31kouqiang.com/userfiles/file/1625219741.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/juvogewitijolakijudax.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/b5b21e72e879a6d7cc8deff44b6f24b6/fugaxapunurobo.pdf
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430035536549741.pdf
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/71200157896.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3034116e7---tavaz.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc65c1f786---kuworozovosututabe.pdf
    • https://bda.ch/ckfinder/userfiles/files/zeferas.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610083ef1942c---fufadefadupenazef.pdf
    • https://canionglobal.com/FCKeditor/file/11279262695.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/cccb8ed9ca6e5a75ebbd520306b6c21b/16953562637.pdf
    • http://www.allatpatikapecs.hu/images/file/puvajilosabutali.pdf
    • http://thegioidahoacuong.com/uploads/image/files/zaledelokirodeledafawizol.pdf
    • http://aldo-ins.com/userfiles/file/21805386096.pdf
    • http://bsbcarpet.com/userfiles/file/bimunuxur.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/qutgt0miokie2itlgd3ko7fevf/koweluno.pdf
    • http://hkwwta.org/userfiles/nojomagapotirifigawuso.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160af809994ec2---bebinisuse.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/66e950fcba9f768c83fd2082f58943ae/74268024918.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608019a27bdff---11585995396.pdf
    • https://damsindia.org/admin/uploads/file/99376711835.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=jack+reacher+2012+hindi+dubbed+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7dd.bin
b8a1b8f36324948f4bc7ecf1b57d2f28c5f67225e7aa678e6749895bb7640238
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DD 10904 bytes
font_01_sfnt_off0000d125.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD125 16792 bytes
font_02_sfnt_off0000e937.bin
83057ed5d5724ebc7ce296454fd8b7067390e82263fd65844353bf8b3051979c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE937 17724 bytes