Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b67c2bed4918a57…

MALICIOUS

PDF

85.3 KB Created: 2021-09-08 10:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9e9207f1a54a1861b04d442dc0725eca SHA-1: bedadfd5d5c0abecb69de6f8e29a98685f4e5bd5 SHA-256: 6b67c2bed4918a57349a3eb65a223234817ad2b040afeca14d1a474a8273ef0c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with numerous embedded URLs pointing to various domains. Heuristics indicate that these links are likely part of a phishing or malware distribution scheme, leveraging compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://dhleisure.com/ckupload/files/31674842617.pdf In PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/1803b01fd3e2f1814cc79f9342ab93dc/kaxigevadimusemakozizinuw.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/timesogag.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b78b84ff6---10628141474.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/majuzar.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/dojujoturevekolov.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82eb26b812---borujapa.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/tukezanol.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/ratopuwoxonag.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/goxoponudijefegesuwa.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/95045333334.pdfIn PDF document text
    • http://kco.su/userfiles/file/keseponatovobujiwafega.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/komibakejejovatixubik.pdfIn PDF document text
    • http://langyupharm.com/upload/files/zafixuset.pdfIn PDF document text
    • http://agro-partner.com/Image/files/migixigoxevaz.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d3b2951e19611cfb5291c2aec7dc2374/48933953273.pdfIn PDF document text
    • https://np21bellapalermoshopping.it/file/kapuloxefaluzix.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/sl9845os4rhtqkr2s6glf2hrc6/suzave.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/47608373734.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/4413575276.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/95292193916.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ed5f4bea9---nidinebopinelurajibij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=contoh+makalah+thaharah+pdfPDF 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_off0000deb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 22368 bytes
SHA-256: 0c949da56a1e0a2747656758e50b0e6858e7511a8a7ab0ba53fabecc69ccf9ba
font_02_sfnt_off00013023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13023 10492 bytes
SHA-256: 3ce11f1fc507747411228b9c23c52b320b15c5f5bcfa15199639feb263c6af65