Malicious PDF — malware analysis report

Static analysis result for SHA-256 16189b96bcaf21be…

MALICIOUS

PDF

99.4 KB Created: 2021-09-08 03:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 93f3623cdbdfe24068de3361ca72ebdd SHA-1: 54d5135084c1c95c0238789dd8dde7bad300d86b SHA-256: 16189b96bcaf21be7ace74ced91ab2728f205c05e1e4c48a17f72631912836bb
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://coretry.ru/uplcv?utm_term=igcse+economics+notes+pdf+download PDF link annotation
    • http://alnadaoil.com/userfiles/file/rimazo.pdfIn PDF document text
    • https://clinicscrm.com/img/files/fuxonavupix.pdfIn PDF document text
    • http://epicridesnepal.com/files/86268655086.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c01354999dd---10610929444.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/63680630788.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/70684892886.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/moxixadam.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/ralivosigugodusov.pdfIn PDF document text
    • http://orthodoxnews.us/file/nobadetusipegokura.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/47486627909.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/37378361449.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160740fd046fba---xuwazafukobefoxosunuzaras.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/34672464194.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afde273b078---99015677009.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/49202581898.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/7008550583.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/rexato.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c36df84f93b---kumepojowufofos.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/74358879531.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/notazenejiboxuri.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/76067597234.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/dbcb8307ab9a1ce7adb8461ff6651b64/patozimafilasizeninanow.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/72897939018.pdfIn PDF document text
    • http://freewest.at/gubenix.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/4656140489.pdfIn PDF document text
    • http://araonline.hu/uploads/file/bonizodabalupunagoxijota.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C3 21236 bytes
SHA-256: e3f0c44cc56234ad6254140e678ec00774be8678fe73d4147a286d138b3a5307
font_01_sfnt_off00014e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E6A 10900 bytes
SHA-256: 80ee47d862e9bff3368ce6d8198d6bc250a6434d6a83016b11068acd36464467
font_02_sfnt_off00016781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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