Malicious PDF — malware analysis report

Static analysis result for SHA-256 415a976daffe08f7…

MALICIOUS

PDF

99.0 KB Created: 2021-07-31 07:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a3cf52b0a11eb7613f33178e92abb99 SHA-1: 05c411df00144d5e36d605dc3892cdbac5be714e SHA-256: 415a976daffe08f7c91f39b2a323154b0efb4f31734791239cd8943714d96561
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of external URIs and link farms points towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://muzeumostrowiec.pl/obrazy/file/95117587564.pdf In PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa237ec2856---burikoberefujizelekef.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4ee969973---gadujirafesetir.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f0028f0fd---30260670348.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/97644263254.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/6900628470.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/8unl0g3m86bouk4qq0va0ctjhe/24964308418.pdfIn PDF document text
    • http://tfforming.ru/d/files/78104235201.pdfIn PDF document text
    • http://thepdaitruongphat.com/upload/ck/files/zozulosex.pdfIn PDF document text
    • http://anupbolivia.com/images/files/7649192427.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/bemes.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/93953081579.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/2ljhn43f4845t4lhd5rkdi4rjg/99793954276.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/sililu.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9d25e45b3---13934141517.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/71527098679.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd19da7384768c607ee01b2ed6ab58b5/90915410512.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/zelika.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/fotibujor.pdfIn PDF document text
    • http://computerdoki.hu/user/file/4101212957.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/ljra5h1uaph9kuni0gpfcq8g71/28275082541.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/webezagazewiseluxawokew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+recover+photos+from+iphone+backup+filePDF 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_off00011a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A73 11220 bytes
SHA-256: 04763a16e18109bf63a0bbd0588c20f83c885c136037fe3c839f5a999f0ef7a4
font_01_sfnt_off0001345d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C6F 17908 bytes
SHA-256: 0bf0cbd6b81a1279a21ed9a727544a67a99e7a95e3518573701f240adcf30918