Malicious PDF — malware analysis report

Static analysis result for SHA-256 e143551d28944bef…

MALICIOUS

PDF

103.0 KB Created: 2021-06-20 03:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 735dceef320700e2021db5d11dc2f4ef SHA-1: 0542e0c61ef1849e340fdf25777cba2632c67677 SHA-256: e143551d28944befb1d75d667dd09345b00c055787028c0dd5baf6b9ec30e1f9
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to movie subtitles, likely serving as a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://rghsalumni.com/clients/82979/File/sidekitazilujigoju.pdf In PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/sot4uk1g0juifqa8njof55ccod/90482368854.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbbb7da708---boforijavujigufixos.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/cd46523131712558b2abda9db3f24119/76491943592.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/fbpmu8phjf9qeruj4ejl24k07j/xasulenararugete.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16083a766b4080---biwolunivawul.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/13736937d51ace419d7f8894f69f41b7/nevusojexa.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/g3kj5lhgh0b4e6kfdis6r54ch4/15009369662.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/81272788630.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/72pvn8figvs8e6588qtmbgb234/56821610910.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/juv4gq3jp7r5nkbhvses837nqg/86785688369.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606deb07d2dec---beribapedodi.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/31054592450.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=kingsman+the+secret+service+subtitles+englishPDF 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001758b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1758B 17048 bytes
SHA-256: 3bdbd5f6811515b3dc432917a2151fdc165b01a9e6f58ee8d32af99c4145da53
font_00_sfnt_off00011f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4D 2988 bytes
SHA-256: 546acd1a5a47648eedd65b65f2bc63d7c13a5797fedbece43ef8ae6b2ec800f9
font_01_sfnt_off000129ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FF 5384 bytes
SHA-256: 33ffc15e4a4296f5dba3524cf208604f990b7177061a344f1e9b46cefa84bc85
font_02_sfnt_off00013c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C33 20036 bytes
SHA-256: 5f5f2c6027145a9179adbc155bc81f5da3065d7769ae420b33168868059a1249