Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6cdc7fcae10490f…

MALICIOUS

PDF

74.8 KB Created: 2021-09-25 16:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2ca617cbbe1d0a25725469e9cd95f12a SHA-1: 87822f99831d658a477aed5fde42b75f55dcb439 SHA-256: c6cdc7fcae10490fc7709aa89337749eb0732db7595fd5a773d694468ebd7a10
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised WordPress sites. This suggests an attempt to lure users to malicious destinations, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://kayamedbursa.com/userfiles/file/28758042878.pdf In PDF document text
    • http://fsf-vastroad.com/userfiles/file/84272317770.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/wavuminalaveniv.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/telewaven.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/29571949672.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/20669840902.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/72795329558.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/42048553628.pdfIn PDF document text
    • https://electroagro.es/pub/files/13414915228.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/lo6eoereg79ltuo1pd3r0oa9op/doxufu.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/lakejizipusuji.pdfIn PDF document text
    • https://datenglagi.com/contents/files/vefekufagap.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140bd6354b1d---nujudune.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/44883a29ca3e6b18f82b665770d63802/miwuduwewuruw.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/63858058066.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/dilogar.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/jijufuzevemefawifomesir.pdfIn PDF document text
    • https://marosme.ro/hirek/file/43822407306.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab5028343a---12180505828.pdfIn PDF document text
    • http://zl369.net/userfiles/file/61973658569.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/resimos.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/1ce2e8352faf4ddc149ff36dbd5559a6/92549460034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=discrete+mathematics+and+its+application+7th+edition+solutionPDF 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_off0000bf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF68 10928 bytes
SHA-256: ea87519d7fbe99fe30b8e8774f552668caf079cc90bf482f6144451c5c85bbbe
font_01_sfnt_off0000d896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD896 17264 bytes
SHA-256: 4032bfd4fb2f46943cb94655da851b81106b467fbf2e75d046854e0570e97a84
font_02_sfnt_off000104c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1