Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc66efe7d828cd7…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 08:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 772dda564a7b49ea0a479267ca1d8f5e SHA-1: 6313a70b79df89721f0e89af656fc3726da9e77e SHA-256: 9fc66efe7d828cd787f525e116472de3ec28c730cc68e9733f391ef9993c751c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to manipulate search engine rankings or distribute phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/633411d4b564ecad6557fb975a386aef/tirodonezulejuwul.pdf In PDF document text
    • https://huuphongplastic.vn/uploads/images/files/9454705105.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/29dd0830f581adc2a201f87f419e0cde/zenataluganani.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/47094813499.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/d7244fd8ae500669ef1b461b23e4a4f4/redexidetovazode.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/c7aa07cfe6bb952bdaba5e8ab1f7e991/gejijofebakijoz.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607900d050a51---95288485859.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kivafumebegadepex.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77e1ad731f---mukakez.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/mosonodonesuxujefebes.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/24020592766.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/7854e45chk36cevh967h7lmse4/noxipikanogewunefuf.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2e1eb1caf247f90ef4ea91511de3ab4a/sunebesojunoka.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/u13qt77ltdh0s3s2hdie6pjrht/98456816969.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/b39055d6a2c7a0f00f3b2226b2c2d368/jigajazudototidiriza.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/sewapanopiwuzavekepasu.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2himo83ikctoaiqghu5pi05jf6/fanumisivagutip.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/16695126279.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/99836651725.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/runotuk.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/97185519674.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ada33b56759---pomerozarakexafujewu.pdfIn PDF document text
    • http://cga82.com/admin/File/56098812431.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/viwuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=lenovo+ideapad+110-15acl+manualPDF 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_off0000d4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 10772 bytes
SHA-256: 2765309437379d3b5535375f429c0216622ce7c9d5df9794e867f46ba9a40c7c
font_01_sfnt_off0000edd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 17956 bytes
SHA-256: b2e41cfb8c63fd7691d78993c7a409347878a110d296eff7ba8fd642eb32d3d2
font_02_sfnt_off00011ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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