Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e57f7f4123d7f95…

MALICIOUS

PDF

86.7 KB Created: 2021-07-07 09:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4340ebe706100bf0ffa5fa5581fe6986 SHA-1: 0c204e459d0ef5db8fce80bb9aba398b81fa9dc1 SHA-256: 3e57f7f4123d7f9500127587e2dad29ca12a9933ecf86e5fcf76c85d34741e36
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests malicious intent. The primary goal appears to be directing users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/5heqrm96rjlkmsvdlml20l3l4b/16463702243.pdf In PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/zaterupuj.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc6b18e371---sidaxuzi.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/dadadebibijutuvefakedug.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/2a4f9904342790e0940fb0d15bee7b44/2176388590.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/tibinobewudebepupawi.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ed5f2882---bibegufivizugezowagodili.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/d5dc7a6c32c966e1ece382e54c649714/97196955215.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/mibexujibedoluwefafavef.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/noi7tqg03gj2g4vpgudp5pb7fe/2473305079.pdfIn PDF document text
    • http://chinalabware.ru/d/files/21504790000.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/33090163190.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080ee76256cb---73019349598.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/favatabezosudiga.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/sutevavizogepagusidapese.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/7e7e5460c038f91bac36601b19562dad/82052895294.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/31695282103.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/12239782278.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/6k0j5g1p36ejfs1p32jkc5kqn7/6823311312.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/woboxitogofubizemi.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/371aa131f2d5336c36719ae2ed678439/kapewuxeda.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/puxijugefijibawadamesal.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/90083915975.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/u2sk8m9bci2olcgqft09q6a1q6/fadazumi.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/banuxisozel.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/66596901853.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/jakesan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=2+to+the+power+of+3+to+the+power+of+2PDF 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_off0000eebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 10164 bytes
SHA-256: 998705bcc77df3687eb1b2e208c4de2f05a9c9a86532a138640b630032514b8b
font_01_sfnt_off000105bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BD 17432 bytes
SHA-256: 8c392f6b3af3301f0556c0b3f13924b6ea6c703d29d2009ec6a306dda025bb7d
font_02_sfnt_off00013373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13373 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1