Malicious PDF — malware analysis report

Static analysis result for SHA-256 8050070141634cbb…

MALICIOUS

PDF

96.0 KB Created: 2021-07-20 02:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ce5eb3d6b7b087616b130eedde5bceaf SHA-1: 811413bd59367b13ab4a6746539d60e61bd73cdc SHA-256: 8050070141634cbb7c92bc9b9b854e30a0fef31a4b6b31ee5c0e7c53e543c902
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, but the presence of multiple links to potentially compromised domains strongly suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • 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.
  • 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://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3809a4a8e---82767361907.pdf In PDF document text
    • https://agrilaui.com/userfiles/file/23707413579.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a7b41be60---54976245782.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/rigosuw.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ccd95422c---belotid.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/vopepuz.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e088e12f828---86927510696.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608067f870ebd---54495680006.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9e0735d22---tisisalejopurijosepo.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec42899c76---19253159904.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/71571742184.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f094d4af---zemobevorefunet.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/galozemilesedevusikape.pdfIn PDF document text
    • http://gardatrans.com/content/Files/94761672737.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/68642467260.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/hk592g09brfdbpd29baml500jn/kutumusofapate.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8edd35325---55816361678.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/81932977306.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/zapazudoberakusonexupiwe.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/betesizurugufa.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b381a8c78eb2d16578573485206a49d0/bekakoxikibunodi.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4292f2d531458dd10347defb65f8abe5/kaxoteponorusimikukatewo.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160968d33b03bb---balebepovupitinigazebuz.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/movawonojufupedozupi.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb12db5791---noriwaxevejit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=microbes+in+human+welfare+pdf+notesPDF 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_off00011403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11403 17088 bytes
SHA-256: 47e16d8c1b2e32a15a1aa026764c92d9d4e7470767deeea9b05600b0b27a69bb
font_01_sfnt_off000140c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C6 11204 bytes
SHA-256: 19839c0fd68d609a467476cb22cbb4a3b5b01313423df8e88b45fb2ab866088c
font_02_sfnt_off00015aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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