Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aec06a628d7c14c…

MALICIOUS

PDF

85.7 KB Created: 2021-08-26 01:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2ac1baa3f344cae0eb3fc663c650316 SHA-1: 808babfd907d02c5e72230a6de4ff585b2be3b49 SHA-256: 9aec06a628d7c14ceca789ce054b2b9d54becfdba1a5fbe83f009fdf816e8cb4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links point towards an attempt to redirect users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huaienclinic.com/uploadpic/files/56584118101.pdf In PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160859c60b1190---57027765732.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/95432690253.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/164d910f3574cd5a8b1974527280194c/96701757747.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/78352643621.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/7d29eghjf9cmjlim7lbnfb9aqc/44052487798.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/kukejotowitoriwuxarabok.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/fikizolofawutufiwumolud.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/vafuzi.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/1mi6du4pftrvob499cd4sqmqek/26297472745.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/bumebivusevawijozijuga.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/85779388431.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/75675083951.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c6c4580f1fbe98b0cb146cb5587ccdc1/xekepiriwikowakaxasut.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/77596967915.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/ee0dda149103be1b82ed4756386c4ddb/ditowo.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609673b1053cd---wapavunapogokagejase.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/zegegogelogide.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/92c272c0730a8d4eb16613e9eb908da0/buboperiketopakasomukune.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/kezekuwi.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ace96ddebe---bamopibi.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/10224708710.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/eau56tlb7bu0agdvbdvmn902n8/rimisasikejolavapofupo.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756243c8e2a---kutekodobepada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=physical+topology+in+computer+networkPDF 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_off0000e98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98D 16944 bytes
SHA-256: acdaef2de28427addb38a4079948ddf38ecae59b9ca545b7e98b96d309f92cf6
font_01_sfnt_off0001158c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA3 11212 bytes
SHA-256: d4702ddd4024d88d54b1996c1dc87dc0961d2fbc91b825d30abab400ebf73921

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