Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa0fa23f55e04a8…

MALICIOUS

PDF

77.0 KB Created: 2021-08-30 10:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 71b5763df4166ba0b3f508cf7454b3cb SHA-1: d7e076a5af4111fa9ebf019fed54f2d4003028c7 SHA-256: aaa0fa23f55e04a8e6d9c44722d6c6c885528a206b9dc8d6354be73d6b70f7a4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using link farms for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nomaquito-travel.com/editor-images/64387868308.pdf In PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bb67e3549cb---3806681697.pdfIn PDF document text
    • http://contextuae.com/resimler/files/lilavosakonufepekugopupe.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9080241b97---rizemuvorodefoteluvixisa.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/64950987933.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/pukofagola.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/povepojexomok.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/14775945473.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161066ddfc9ebe---ganojufuwujopebilojuf.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/27263486570.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/1053d18d1f2aaabc25b2a574e9fa7dcb/dunuzukopemubowifof.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/rabarumajuxisomumow.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e648e0b0962---58377590930.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/pajonimegumewewape.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/84355855463.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/75642792418.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8o8hbu4r07o6gtbe88lkalg2l1/67714805037.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18a1f42a29---risubozipiw.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/8957206471.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/85412615192.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/37370683744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+wicked+king+read+onlinePDF 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_off0000c9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E7 17612 bytes
SHA-256: 69b6ed57a105d714659a227941aaa0f2367f9329fdd116eebaa9cefadf588553
font_01_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 10524 bytes
SHA-256: 747c64d85bde04563ac2c2041abf197585e26aa578ffd0e2baa0903da5ce90b9
font_02_sfnt_off00010e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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