Malicious PDF — malware analysis report

Static analysis result for SHA-256 66503bab61f1be01…

MALICIOUS

PDF

79.8 KB Created: 2021-09-10 14:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0857f7932fab1c13f34c305747c7163d SHA-1: 18b52aba64f5d5214d3673ca08bbbf652e8956ea SHA-256: 66503bab61f1be011c23480c735928994d96166b4c5e6c8d3ba36adede723616
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through the link farm. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=meaning+behind+444 PDF link annotation
    • http://gernano.eu/gfx/userfiles/files/29463722808.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/vizatitodis.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/36826298051.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/69226705760.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/82586893235.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/kibigekavex.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/54116282489.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/8965597486.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s9vjnu5ie8o7eb3emsij41qmh4/85857617385.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b50efaec857b52bf984aec24b20b9a5/luramofevadupoko.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/66869822844.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/nuwijitag.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/jorov.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/72028740660.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161373811a961b---kubivanosivala.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137987f87591---relirigafemetojarogenuwis.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/57331738677.pdfIn PDF document text
    • http://landpas.pl/upload/file/welenusorajesevasu.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/98203539997.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/vemimakekizuk.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/jaresowixaxawomuwar.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/mutelimofadesalipanu.pdfIn PDF document text
    • https://longhoang.vn/upload/files/zotome.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/belasuzifoxuwozapuwiriz.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 10208 bytes
SHA-256: b0c253a93d6c332751bbbf6e675a5d227c0c901ba4dfe670cc56684553911d8d
font_01_sfnt_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 16904 bytes
SHA-256: 96aea8a5234f5d3339d80a24e8f7e9016901603e02d2519263aa5f46a89eae4c
font_02_sfnt_off0001198c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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